CHD Elektroservis VS-MIDI 8-434 User manual

7
Model 8-434
ver. 1.0
USER MANUAL
© 2009 CHD Elektroserv is

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
2
Content
page
1. Interface description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.1. Interface functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2. Interface operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.1. MIDI system integration / connection . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2.2. Operating mode indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3. Initialization sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3. Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3.1. System parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1.1. “MIDI Channel“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1.2. “VCF CC Nr.“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1.3. “VCA CC Nr.“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1.4. “EG Break Pulse“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.1.5. “VCO Calibration“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2. Preset parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.2.1. “VCO Key Shift“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2.2. “VCO Pitch Bend Range“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2.3. “VCF Mode“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.2.4. “VCF Key Follow“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2.5. “VCF Velocity Amount“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2.6. “VCF Chnl Aftertouch Amount“ parameter . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2.7. “VCA Mode“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3.2.8. “VCA Key Follow“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.9. “VCA Velocity Amount“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.10. “VCA Chnl Aftertouch Amount“ parameter . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.11. “EG Retrigger Mode“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
3.2.12. “EG Retrigger Rate“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.2.13. “Indicator Mode“ parameter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
4. MIDI implementation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1. Channel commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1.1. Note On/Off . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1.2. Control Changes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1.3. Program Change . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1.5. Channel Aftertouch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.1.6. Pitch Bend . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2. System commands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.1. MIDI Clock . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.2.2. Reset . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20
4.3. System exclusive communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
5. Technical specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
6. Warranty conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21
Appendices
A. MIDI implementation chart . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22
B. Error indication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
C. MIDI loopback . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
3
1. INTERFACE DESCRITPION
VS-MIDI Interface is dedicated for the MIDIfication of the Vermona Synthesizer. The interface
can not only control VCO over MIDI but also, VCF, VCA and EG of the instrument.
1.1. INTERFACE FUNCTIONS
Interface controls the keyboard and GATE signal generator in parallel manner. The interface
circuits are also inserted between envelope generator (EG) of the instrument and its VCF and VCA.
The interface integration schematics is shown on the pic. 1.
Pic. 1 – Block schematics
GLIDE
&
CV MEMORY
GATE
GENERATOR
VCO 1
VCO 2
VCF VCA
LFO EG
GENERAL
TUNE
MIDI INTERFACE
GATE
ADS RADSR
ADS R
LFO
UTS
D/A
CPU
MOD
MOD
MIDI INMIDI THRU / OUT
2. INTERFACE OPERATION
Interface does not have any control switches/pots. All functions are controlled by MIDI
parameters (see chapter 4.). Parameters can be adjusted/set by MIDI commands sent from the host
MIDI system to the MIDI IN of the interface.
2.1. MIDI SYSTEM INTEGRATION / CONNECTION
Interface has MIDI In and OUT connectors. To connect the instrument to the MIDI system use
standard MIDI cables with DIN 41524 connectors (5 pins 180°).
The MIDI data from the master system (PC, sequencer, keyboard controller, etc) used to control
the Vermona Synthesizer are receiving at MIDI-IN input. If there are no other devices controlled from
the MIDI system and/or the data transfer from the interface to the host MIDI system is not required,
only MIDI-IN cable is necessary.
Pic. 2 MIDI system integration

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
4
All MIDI data incoming at MIDI-IN input are transmitted unchanged to MIDI-THRU/OUT output
(THRU function). Own SysEx messages that answers the requests from MIDI host system are sent to
MIDI-THRU/OUT output simultaneously (OUT function).
2.2. OPERATING MODE INDICATION
The user is informed about the actual interface status by the dual color indication LED under the
“MAINS“ switch on the instrument’s front panel. Indication LED lights red in quiescent condition – it
indicates on-status of the Vermona Synthesizer instrument. The interface activity is indicated by the
yellow light of the indication LED. The type of the LED indication can be user adjusted by the preset
parameter “Indicator Mode“ (see further in the manual).
If there is an error occurred, the indication LED starts to blink with the period of 0,5 second (see
appendices).
2.3. INITIALIZATION SEQUENCE
Always when the instrument is switched on, automatic reset sequence is executed. Immediately
when the instrument is switched on it works standard way, like no MIDI interface is installed. If
there are any MIDI commands/notes received, the interface take over the control of the VCO, VCF and
VCA circuits of the instrument and the instrument’s own keyboard can not be used yet! Together
with the MIDI control all knobs and switches of the instrument work the standard way.
It is necessary to reset the interface to use the instrument’s keyboard again. It might be done by
switching the instrument off and on. Interface reset can be executed by the MIDI common system
command “Reset” or by System Exclusive message “HW Reset“ (see System Exclusive
communication).
3. PAR AM ETER S
The parameters settings affects significantly the incoming MIDI commands processing and the
Vermona Synthesizer circuits operation. Parameters are divided in to basic groups – system
parameters and preset parameters – see pic. 3.
Pic. 3 – Internal memory structure
All parameters are stored in internal memory of the interface – there is one bank for system
parameters and 32 banks for preset parameters. The content of the memory banks can be read or
changed by the Bulk Dump SysEx Messages (see description of the System Exclusive
communication).

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
5
Preset parameters, that directly controls the sound of the instruments, can be individually
adjusted in the editing buffer by the MIDI Control Changes commands. All changes can be saved in
one of the preset parameter memory (by the MIDI System Exclusive command).
3.1. SYSTEM PARAMETERS
The system parameters control the basic function of the interface. System parameters are
always valid independently on the actual preset settings – the change of the system parameters take
effect the same way in all user presets.
The values of system parameters, that are saved in factory or if “Factory Reset“ is executed (see
description of the System Exclusive communication), shows table 1.
Table 1 – Range of the allowed values and default values of the system parameters
Value range „Factory Reset“ values
Parameter name [dec] [hex] [dec] [hex]
MIDI Channel 0 ~ 15 00 ~ 0F 0 00
VCF CC Nr. 0 ~ 119 00 ~ 77 29 1D
VCA CC Nr. 0 ~ 119 00 ~ 77 30 1E
EG Break Pulse Duration 0 ~ 58 00 ~ 3A 6 06
VCO Calibration 0 ~ 127 00 ~ 7F 64 40
System parameters can be changed only by Bulk Dump SysEx Messages (see System
Exclusive communication). All changes are activated after the interface reset – when the instrument is
switched on next time!
3.1.1. MIDI CHANNEL
Parameter selects the MIDI channel for the communication of the interface with the MIDI system.
It is possible to choose any of the 1-16 channels.
The parameter values are 0 - 15. Value 0 is for MIDI channel Nr.1, value 1 selects Nr. 2 etc. up
to value 15 which selects MIDI channel Nr. 16
3.1.2. VCF CC Nr.
Control voltage for VCF of the instrument can be used from own envelope generator (EG) of the
instrument or just one MIDI controller can be used (see preset parameter “VCF Mode“). Number of the
controller, which values are directly converted to Control voltage for VCF of the instrument, is user
definable by the system parameter VCF CC Nr. The value of this parameter (0 - 119) directly defines
the MIDI controller number (Control Changes Nr.) selected for VCF control of the instrument.
ATTEN TION ! If the selected controller is used for a different purpose already (e.g. CC64 – Hold,
CC68 – Legato, CC 16~28 – preset parameters setting), the previously used function of the controller
is disabled and the controller controls only VCF of the instrument!
3.1.3. VCA CC Nr.
Control voltage for VCA of the instrument can be used from own envelope generator (EG) of the
instrument or just one MIDI controller can be used (see preset parameter “VCA Mode“). Number of the
controller, which values are directly converted to Control voltage for VCA of the instrument, is user
definable by the system parameter VCA CC Nr. The value of this parameter (0 - 119) directly defines
the MIDI controller number (Control Changes Nr.) selected for VCA control of the instrument.

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
6
ATTEN TION ! If the selected controller is used for a different purpose already (e.g. CC64 – Hold,
CC68 – Legato, CC 16~28 – preset parameters setting), the previously used function of the controller
is disabled and the controller controls only VCA of the instrument!
3.1.4. EG BREAK PULSE
Parameter sets the length of the break impulses (Break) for the EG circuits of the instrument if
the interface is in EG mode – Retrigger (see preset parameter “EG Mode“).
The length of the break impulses is defined by the following formula:
EG BREAK PULSE = (PARAMETER VALUE + 2) / 2 [in milliseconds]
The parameter values range is 0 - 58, corresponding to the length of the break impulses 1 ms -
30 ms. Default value is 6 (e.g. impulse with the length of approx. 4 ms). It is suitable for the most
situations, only in the exceptional situations the value of the parameter can be adjusted to to provide
reliable reaction of the Vermona Synthesizer EG circuits. (see pic. 5).
3.1.5. VCO CALIBRATION
Table 2 - Values of the calibration constant for VCO fine tune
Calibr.
constant
Tune
shift
Calibr.
constant
Tune
shift
Calibr.
constant
Tune
shift
Calibr.
constant
Tune
shift
Calibr.
constant
Tune
shift
[dec] [cent] [dec] [cent] [dec] [cent] [dec] [cent] [dec] [cent]
0 -101,59 26 -60,32 52 -19,05 78 +22,22 104 +63,49
1 -100,00 27 -58,73 53 -17,46 79 +23,81 105 +65,08
2 -98,41 28 -57,14 54 -15,87 80 +25,40 106 +66,67
3 -96,83 29 -55,56 55 -14,29 81 +26,98 107 +68,25
4 -95,24 30 -53,97 56 -12,70 82 +28,57 108 +69,84
5 -93,65 31 -52,38 57 -11,11 83 +30,16 109 +71,43
6 -92,06 32 -50,79 58 -9,52 84 +31,75 110 +73,02
7 -90,48 33 -49,21 59 -7,94 85 +33,33 111 +74,60
8 -88,89 34 -47,62 60 -6,35 86 +34,92 112 +76,19
9 -87,30 35 -46,03 61 -4,76 87 +36,51 113 +77,78
10 -85,71 36 -44,44 62 -3,17 88 +38,10 114 +79,37
11 -84,13 37 -42,86 63 -1,59 89 +39,68 115 +80,95
12 -82,54 38 -41,27 64 ±0,00 90 +41,27 116 +82,54
13 -80,95 39 -39,68 65 +1,59 91 +42,86 117 +84,13
14 -79,37 40 -38,10 66 +3,17 92 +44,44 118 +85,71
15 -77,78 41 -36,51 67 +4,76 93 +46,03 119 +87,30
16 -76,19 42 -34,92 68 +6,35 94 +47,62 120 +88,89
17 -74,60 43 -33,33 69 +7,94 95 +49,21 121 +90,48
18 -73,02 44 -31,75 70 +9,52 96 +50,79 122 +92,06
19 -71,43 45 -30,16 71 +11,11 97 +52,38 123 +93,65
20 -69,84 46 -28,57 72 +12,70 98 +53,97 124 +95,24
21 -68,25 47 -26,98 73 +14,29 99 +55,56 125 +96,83
22 -66,67 48 -25,40 74 +15,87 100 +57,14 126 +98,41
23 -65,08 49 -23,81 75 +17,46 101 +58,73 127 +100,00
24 -63,49 50 -22,22 76 +19,05 102 +60,32
25 -61,90 51 -20,63 77 +20,63 103 +61,90

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
7
Parameter sets the calibration constant of the D/A converter controlling the VCO of the instrument
when the exact tuning of the instrument keyboard and master MIDI keyboard is required. Parameter
provides fine tune of the VCO of the instrument for the MIDI control.
The parameter values range is from 0 to 127. It corresponds to the fine tune of approx. ±100
cents, tuning step is 1, 5873 cent (see table 2).
3.2. PRESET PARAMETERS
The preset parameters set function of the interface whose influence sound of the instrument. The
preset parameters sets, which MIDI commands are going to control VCO, VCF, VCA and EG circuits of
the Vermona Synthesizer.
Table 3 – Range of the allowed values and default values of the preset parameters
Value range ”Factory Reset“
values
Setting with
MIDI CC Nr.
Parameter name
[dec] [hex] [dec] [hex] [dec] [hex]
VCO Key Shift 0 ~ 84 00 ~ 54 53 35 16 10
VCO Pitch Bend Range 0 ~ 12 00 ~ 0C 12 0C 17 11
VCF Control Mode 0 ~ 2 00 ~ 02 0 00 18 12
VCF Key Follow
1
) 0 ~ 127 00 ~ 7F 64 40 19 13
VCF Velocity Amount
1
) 0 ~ 127 00 ~ 7F 0 00 20 14
VCF Chnl Aftertouch Amt
1
) 0 ~ 127 00 ~ 7F 0 00 21 15
VCA Control Mode 0 ~ 2 00 ~ 02 0 00 22 16
VCA Key Follow
2
) 0 ~ 127 00 ~ 7F 64 40 23 17
VCA Velocity Amount
2
) 0 ~ 127 00 ~ 7F 0 00 24 18
VCA Chnl Aftertouch Amt
2
) 0 ~ 127 00 ~ 7F 0 00 25 19
EG Retrigger Mode 0 ~ 2 00 ~ 02 0 00 26 1A
EG Retrigger Rate 0 ~ 127 00 ~ 7F 100 64 27 1B
Indicator Mode 0 ~ 3 00 ~ 03 0 00 28 1C
Remarks:
1
) Parameter is not active in VCF mode “Controller“ (VCF Control Mode = 2)
2
) Parameter is not active in VCA mode “Controller“ (VCA Control Mode = 2)
Values of the preset parameters in editing buffer (see pic. 3) are set by the MIDI controllers
(Control Changes) - it is possible to change them during the playing the instrument thus. Default
values of the preset parameters factory stored in the interface memory or after “Factory Reset“
procedure (see SysEx communication), are shown in table 3 (the default values are valid for all user
presets).
Edited values of the parameters are stored in the editing buffer only. The content of the buffer is
saved temporarily only, till the preset change or instrument switch off or hardware reset. To save the
edited parameters it is necessary to save them as a memory preset. There are 32 available preset
spaces. Saving the values in preset memories is done by the MIDI System Exclusive command (see
SysEx communication).

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
8
Pic. 4 – “VCO Key Shift“ parameter influence

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
9
3.2.1. VCO KEY SHIFT
This parameter shifts the keyboard range of the instrument in semitones in the range of 0 up to
+84 semitones. If there is no shift selected, the lowest key corresponds to the MIDI note Nr. 0 and the
highest Nr. 43. When the transposition +1 semitone is set, the lowest note corresponds to the MIDI
note Nr. 1 and the highest Nr.. 44 etc. When +84 semitones transposition is set the lowest key
corresponds to the MIDI note Nr. 84 and the highest to Nr. 127. See Pic. 2.
Value of the parameter can be in the range from 0 to 84; The value of the parameter can be set
by MIDI controller (Control Changes) Nr. 16 – see chapter 4.1.2.
3.2.2. VCO PITCH BEND RANGE
Parameter sets the maximum range of the MIDI command “Pitch Bend“ (“Pitch Wheel“).
Parameter can have the values from 0 up to 12. If the 0 value is set, the pitch bend is switched
off and ignored. Values 1 - 12 sets the maximum detune range in semitones. With the value 12 the
pitch bend detunes the oscillators ±1 octave.
The detune range of the VCO upwards can be limited for the highest octave and detune range
higher that approximately 4 semitones. This limitation is done by the construction of the Vermona
Synthesizer and it can’t be removed.
The value of the parameter can be set by the MIDI controller (Control Changes) Nr. 17 – see
chapter 4.1.2.
3.2.3. VCF CONTROL MODE
Parameter sets the way of VCF control. There are three modes available: ”EG” (value of the
parameter equal 0), ”Gate“ (value of the parameter equal 1) and ”Controller“ (value of the parameter
equal 2). Value of the parameter can be set by MIDI controller (Control Changes) Nr. 18 - see chapter
4.1.2.
”EG“ mode
Standard way of VCF control, where the internal envelope generator (EG) is used as a source of
the control voltage for VCF modulation. Accordingly to the settings of preset parameters “VCF Key
Follow“, “VCF Velocity Amount“, “VCF Channel Aftertouch“ the control voltage can be affected by the
MIDI commands ”Note-On + Velocity” and ”Channel Aftertouch“.
”Gate“ mode
Internal envelope generator (EG) of the instrument is disabled and VCF is controlled by the
square gate signal (equivalent of EG setting: ATTACK = 0, DECAY = 0, SUSTAIN = max., RELEASE =
0). Amplitude of the control voltage can be adjusted by the MIDI commands ”Note-On + Velocity” and
”Channel Aftertouch“ accordingly to the preset settings of the “VCF Key Follow“, “VCF Velocity
Amount“ and “VCF Channel Aftertouch“ parameters.
”Controller“ mode
Special mode – VCF is controlled by one MIDI controller, selected by the system parameter
”VCF CC Nr.“. In this case the control voltage for VCF modulation is controlled by the values of
selected controller only. The preset parameters “VCF Key Follow“, “VCF Velocity Amount“, “VCF
Channel Aftertouch“ and MIDI commands “Note-On” and “Channel Aftertouch“ does not affect the VCF
modulation – they are ignored. This working mode can be used for creation of special sound effects
etc.
3.2.4. VCF KEY FOLLOW
Parameter sets the VCF modulation depth of the key-follow position on the MIDI keyboard.

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
10
If the value of the parameter is 64, the VCF of the instrument remains unaffected by the key-
follow position. For the parameter values from 65 to 127, cut-off frequency of the filter increases
proportionally to the MIDI note number and for the values from 63 to 0, cut-off frequency of the filter
decreases proportionally to the MIDI note number.
The value of the parameter can be set by MIDI controller (Control Changes) Nr. 19 - see chapter
4.1.2.
3.2.5. VCF VELOCITY AMOUNT
Parameter sets the depth of the VCF modulation by the MIDI “Velocity“ commands of the “Note
On“ - cut-off frequency of the filter increases proportionally accordingly to the value of “Velocity“. Value
of the parameter can be in the range from 0 to 127. For the 0 value, VCF is not affected by the
“Velocity“ command at all, for the value127, the maximal depth of the modulation is allowed..
The value of the parameter can be set by MIDI controller (Control Changes) Nr. 20 - see chapter
4.1.2.
3.2.6. VCF CHANNEL AFTERTOUCH AMOUNT
Parameter sets the depth of the VCF modulation by the value of the last received MIDI “Channel
Aftertouch“ command - cut-off frequency of the filter increases proportionally accordingly to the value
of “Channel Aftertouch“. Value of the parameter can be in the range from 0 to 127, for the 0 value, VCF
is not affected by the “Channel Aftertouch“ command at all, for the value 127, the maximal depth of the
modulation is allowed.
The value of the parameter can be set by MIDI controller (Control Changes) Nr. 21 - see chapter
4.1.2.
3.2.7. VCA CONTROL MODE
Parameter sets the way of VCA control. There are three modes available: „EG“ (value of the
parameter equal 0), „Gate“ (value of the parameter equal 1) and „Controller“ (value of the parameter
equal 2). The value of the parameter can be set by MIDI controller (Control Changes) Nr. 22 - see
chapter 4.1.2.
„EG“ mode
Standard way of VCA control, where the internal envelope generator (EG) is used as a source of
the control voltage for VCA modulation. Accordingly to the settings of preset parameters “VCA Key
Follow“, “VCA Velocity Amount“, “VCA Channel Aftertouch“ the control voltage can be affected by the
MIDI commands “Note-On + Velocity“ and “Channel Aftertouch“.
„Gate“ mode
Internal envelope generator (EG) of the instrument is disabled and VCA is controlled by the
square gate signal (equivalent of EG setting: ATTACK = 0, DECAY = 0, SUSTAIN = max., RELEASE =
0). Amplitude of the control voltage can be adjusted by the MIDI commands “Note-On + Velocity“ and
“Channel Aftertouch“ accordingly to the preset settings of the “VCA Key Follow“, “VCA Velocity
Amount“ and “VCA Channel Aftertouch“ parameters.
„Controller“ mode
Special mode – VCA is controlled by one MIDI controller, selected by the system parameter
“VCA CC Nr.“. In this case the control voltage for VCA modulation is controlled by the values of
selected controller only. The preset parameters “VCA Key Follow“, “VCA Velocity Amount“, “VCA
Channel Aftertouch“ and MIDI commands “Note-On + Velocity“ and “Channel Aftertouch“ does not
affect the VCA modulation – they are ignored. This working mode can be used for creation of special
sound effects etc.

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
11
3.2.8. VCA KEY FOLLOW
Parameter sets the VCA modulation depth of the key-follow position on the keyboard.
If the value is equal 64, the VCA is not affected by the position of them MIDI note on the
keyboard. For the parameter values from 65 to 127, VCA level increases proportionally to the MIDI
note number and for the values from 63 to 0, the VCA level decreases proportionally to the MIDI note
number.
The value of the parameter can be set by MIDI controller (Control Changes) Nr. 23 - see chapter
4.1.2.
3.2.9. VCA VELOCITY AMOUNT
Parameter sets the depth of the VCA modulation by “Velocity“ MIDI commands of “Note On“ -
VCA gain increases proportionally accordingly to the value of “Velocity“. Value of the parameter can be
in the range from 0 to 127. For the 0 value, VCA is not affected by the “Velocity“ command at all, for
the value127, the maximal depth of the modulation is allowed..
The value of the parameter can be set by MIDI controller (Control Changes) Nr. 24 - see chapter
4.1.2.
3.2.10. VCA CHANNEL AFTERTOUCH AMOUNT
Parameter sets the depth of the VCA modulation by the by the value of the last received MIDI
command “Channel Aftertouch“ - VCA level increases proportionally accordingly to the value of
“Channel Aftertouch“. Value of the parameter can be in the range from 0 to 127, for the 0 value, VCA is
not affected by the “Channel Aftertouch“ command at all, for the value 127, the maximal depth of the
modulation is allowed..
The value of the parameter can be set by MIDI controller (Control Changes) Nr. 25 - see chapter
4.1.2.
3.2.11. EG RETRIGGER MODE
Pic. 5 – EG Retrigger mode diagram
Parameter enables / disables envelope generator (EG) retrigger function during the lasting MIDI
“Note-On“ command– see pic. 5. Three modes are available : „Off“ (value of the parameter equal 0),
„Fix“ (value of the parameter equal 1) and „MIDI“ (value of the parameter equal 2). The value of the
parmater can be set by MIDI controller (Control Changes) Nr. 26 - see chapter 4.1.2.
„Off“ mode
Envelope generator (EG) retrigger is disabled, EG works standard way.

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
12
“Fix“ mode
Envelope generator (EG) retrigger is enabled, the retrigger period is fixed by the value of
parameter “EG Retrigger Rate“ accordingly to the table 4.
“MIDI“ mode
Envelope generator (EG) retrigger is enabled, the retrigger period is derived from the frequency
of the “MIDI Clock“ MIDI synchronization impulses. The synchronization tempo is set by the “EG
Retrigger Rate“ parameter accordingly to the table 5.
Table 4 - EG retrigger interval – mode “Fix“
Retrigger Retrigger Retrigger Retrigger
CC 26 Time Freq. CC 26 Time Freq. CC 26 Time Freq. CC 26 Time Freq.
[dec] [sec] [Hz] [dec] [sec] [Hz] [dec] [sec] [Hz] [dec] [sec] [Hz]
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
2,500
2,424
2,351
2,280
2,210
2,143
2,078
2,015
1,954
1,895
1,837
1,782
1,728
1,675
1,624
1,575
1,527
1,481
1,436
1,393
1,350
1,309
1,270
1,231
1,194
1,158
1,123
1,089
1,056
1,024
0,992
0,962
0,400
0,413
0,425
0,439
0,452
0,467
0,481
0,496
0,512
0,528
0,544
0,561
0,579
0,597
0,616
0,635
0,655
0,675
0,696
0,718
0,741
0,764
0,788
0,812
0,838
0,864
0,891
0,919
0,947
0,977
1,008
1,040
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
0,933
0,905
0,877
0,851
0,825
0,800
0,776
0,752
0,729
0,707
0,686
0,665
0,645
0,625
0,606
0,588
0,570
0,553
0,536
0,520
0,504
0,489
0,474
0,460
0,446
0,432
0,419
0,406
0,394
0,382
0,371
0,359
1,072
1,106
1,140
1,176
1,212
1,250
1,289
1,330
1,372
1,414
1,459
1,504
1,552
1,600
1,650
1,702
1,754
1,810
1,866
1,925
1,984
2,047
2,112
2,176
2,245
2,315
2,387
2,463
2,538
2,618
2,699
2,786
64
65
66
67
68
69
70
71
72
73
74
47
76
77
78
79
80
81
82
83
84
58
86
87
88
89
90
91
92
93
94
95
0,348
0,338
0,328
0,318
0,308
0,299
0,290
0,281
0,272
0,264
0,256
0,248
0,241
0,234
0,226
0,220
0,213
0,206
0,200
0,194
0,188
0,183
0,177
0,172
0,166
0,161
0,157
0,152
0,147
0,143
0,138
0,134
2,874
2,963
3,053
3,150
3,247
3,350
3,454
3,565
3,676
3,788
3,906
4,032
4,158
4,283
4,425
4,556
4,706
4,854
5,000
5,155
5,319
5,479
5,650
5,831
6,024
6,211
6,390
6,601
6,803
7,018
7,246
7,463
96
97
98
99
100
101
102
103
104
107
106
107
108
109
110
111
112
113
114
118
116
117
118
119
120
121
122
123
124
125
126
127
0,130
0,126
0,122
0,119
0,115
0,112
0,108
0,105
0,102
0,099
0,096
0,093
0,090
0,087
0,085
0,082
0,080
0,077
0,075
0,073
0,070
0,068
0,066
0,064
0,062
0,060
0,059
0,057
0,055
0,053
0,052
0,050
7,692
7,937
8,197
8,439
8,696
8,969
9,259
9,569
9,852
10,152
10,471
10,811
11,111
11,494
11,834
12,195
12,579
12,987
13,423
13,793
14,286
14,706
15,152
15,625
16,129
16,667
17,094
17,699
18,182
18,868
19,417
20,000

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
13
Table 5 - EG retrigger interval – mode “MIDI“
Retrigger Retrigger Retrigger Retrigger
CC 26 Time Beat CC 26 Time Beat CC 26 Time Beat CC 26 Time Beat
[dec] [ticks] [-] [dec] [ticks] [-] [dec] [ticks] [-] [dec] [ticks] [-]
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
128
127
126
125
124
123
122
121
120
119
118
117
116
115
114
113
112
111
110
109
108
107
106
105
104
103
102
101
100
99
98
97
2/1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
96
95
94
93
92
91
90
89
88
87
86
85
84
83
82
81
80
79
78
77
76
75
74
73
72
71
70
69
68
67
66
65
1/1
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
64
65
66
67
68
69
70
71
72
73
74
47
76
77
78
79
80
81
82
83
84
58
86
87
88
89
90
91
92
93
94
95
64
63
62
61
60
59
58
57
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
1/1
3
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
1/2
-
-
-
-
-
-
-
-
-
-
-
-
-
-
-
96
97
98
99
100
101
102
103
104
107
106
107
108
109
110
111
112
113
114
118
116
117
118
119
120
121
122
123
124
125
126
127
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
17
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
1/2
3
-
-
-
-
-
-
-
1/4
-
-
-
-
-
-
-
1/4
3
-
-
-
1/8
-
-
-
1/8
3
-
1/16
-
1/16
3
1/32
1/32
3
1/64
3
3.2.12. EG RETRIGGER RATE
Parameter sets the frequency of the EG retrigger, if the “EG Retrigger Mode“ parameter is in
“Fix“ or “MIDI“ modes.
Parameter can have the values from 0 to 127 with corresponding retrigger intervals for “Fix“ or
“MIDI“ modes as described in table 4 and table 5 and in diagrams on pictures 6 and. 7.
The value of the parameter can be adjusted by MIDI controller (Control Changes) Nr. 27 – see
chapter 4.1.2.

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
14
Pic. 6 – EG retrigger interval accordingly to “EG Retrigger Rate“ parameter – “Fix“ mode
Pic. 7 – Tempo of EG retrigger accordingly to “EG Retrigger Rate“ parameter – ”MIDI“ mode
3.2.13. LED INDICATOR MODE
Parameter sets the LED indicator function. Four modes are available: ”OFF“ (value of the
parameter equal to 0), ”MIDI“ (value of the parameter equal to 1), ”Gate“ (value of the parameter
equal to 2) and ”Retrigger“ (value of the parameter equal to 3). The value of the parameter can be set
by MIDI controller (Control Changes) Nr. 28 - see chapter 4.1.2.
”OFF“ mode
In this mode, the LED indicator is switched off – lights red and indicates that the instrument is
turned on.
”MIDI“ mode
In this mode the LED indicates incoming MIDI commands acceptable by the interface. MIDI data
going thru (function ”Thru“) are not indicated. Always when acceptable MIDI data is received, the LED
blinks yellow. If the data flow is continuous (databyte more frequent than approx. 100 ms) the LED
lights constantly.
”Gate“ mode
In this mode the indication LED copies the envelope generator (EG - Gate) status.
”Retrigger“ mode
LED indicator blinks in the tempo of the envelope generator (EG) retrigger.

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
15
4. MIDI IM PLEMENTATION
Interface can communicate by all available methods – it recognizes channel, common system as
well as SysEx MIDI commands.
4.1. CHANNEL COMMANDS
Interface recognizes channel MIDI commands "Note Off", "Note On", "Control Changes",
"Channel Aftertouch", “Pitch Bend“ and "Program Change". The commands are received on the
channel defined by the system parameter “MIDI Channel“.
4.1.1. NOTE ON/OFF
Interface accepts “Note-On“ and “Note-Off“ commands in the range of max. 44 notes. Accepted
note numbers are defined by the “VCO Key Shift“ parameter.
Although Vermona Synthesizer is monophonic instrument, the interface memories last six active
“Note-On” commands. This is important, when more key are pressed on master keyboard and the last
is released. In this case the interface switches back to the last note (key). If there are six notes
received the last note received replaces the first note received (last received note has the highest
priority).
4.1.2. CONTROL CHANGES
Interface recognizes standard controllers Nr. 64, 68, 120, 121, 123 and other controllers are
used for temporary adjusting the parameters in editing buffer of the preset (controllers 16 - 28).
Besides this, two controllers are used for direct control of VCF and VCA – numbers of these controllers
are user definable (see system parameters “VCF CC Nr.“ and “VCA CC Nr.“
CC 64 – Hold
Controller works standard way: holds tone generator of the instrument playing / active during the
time when the "Hold" command is active (hold pedal pressed). Values from 64 to 127 are recognized
as “ON”, values from 0 to 63 as “OFF”.
CC 68 – Legato
The controller enables (values from 64 to 127) or disables (values from 0 to 63) Legato play, eg.
repeated start of the instrument’s envelope generator (EG) while receiving more MIDI “Note-On“
commands simultaneously. If the Legato is on, the new note only changes the control voltage for VCO
and the EG remains unaffected.
If the Legato is on, preset parameter “EG Retrigger Mode“ is ignored – it is always set “Off“. After
switching off the Legato, the original “EG Retrigger Mode“ is recalled automatically.
CC 120 – All Sound Off
The VCO is muted and EG is switched off immediately after receiving of this command –
independently on MIDI commands “Note-On” received previously.
CC 121 – Reset All Controllers
“Hold“ and “Legato“ controllers are immediately switched off (if active) after receiving of this
controller and also the “Pitch Bend“ detune is cancelled.

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
16
CC 123 – All Notes Off
Same as with “All Sound Off”, the VCO is muted and EG is switched off immediately after the
receiving of this command.
CC 16 – Own controller: VCO Key Shift
Received value of the controller is converted to the value of “Key Shift“ parameter accordingly to
the pic. 8 and table 6. Value of the “Key Shift“ parameter is set temporarily – valid till the next change
of the controller or till the instrument switch off. Always when the “Key Shift“ parameter is changed,
VCO is muted and EG is switched off and the transposition change take affect for the next received
MIDI notes.
Table 6 – CC 16 values conversion to “Key Shift“ parameter values (in semitones)
CC Shift CC Shift CC Shift CC Shift CC Shift CC Shift CC Shift CC Shift
0 +0 16 +10 32 +21 48 +31 64 +42 80 +53 96 +63 112 +74
1 +0 17 +11 33 +21 49 +32 65 +43 81 +53 97 +64 113 +75
2 +1 18 +11 34 +22 50 +33 66 +43 82 +54 98 +65 114 +75
3 +1 19 +12 35 +23 51 +33 67 +44 83 +55 99 +65 115 +76
4 +2 20 +13 36 +23 52 +34 68 +45 84 +55 100 +66 116 +77
5 +3 21 +13 37 +24 53 +35 69 +45 85 +56 101 +67 117 +77
6 +3 22 +14 38 +25 54 +35 70 +46 86 +57 102 +67 118 +78
7 +4 23 +15 39 +25 55 +36 71 +47 87 +57 103 +68 119 +79
8 +5 24 +15 40 +26 56 +37 72 +47 88 +58 104 +69 120 +79
9 +5 25 +16 41 +27 57 +37 73 +48 89 +59 105 +69 121 +80
10 +6 26 +17 42 +27 58 +38 74 +49 90 +59 106 +70 122 +81
11 +7 27 +17 43 +28 59 +39 75 +49 91 +60 107 +71 123 +81
12 +7 28 +18 44 +29 60 +39 76 +50 92 +61 108 +71 124 +82
13 +8 29 +19 45 +29 61 +40 77 +51 93 +61 109 +72 125 +83
14 +9 30 +19 46 +30 62 +41 78 +51 94 +62 110 +73 126 +83
15 +9 31 +20 47 +31 63 +41 79 +52 95 +63 111 +73 127 +84
Pic. 8 – CC 16 values conversion to “VCO Key Shift“ parameter value

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
17
CC 17 – Own controller: VCO Pitch Bend Range
Received value of the controller is converted to the value of the parameter “VCO Pitch Bend
Range“ accordingly to the pic. 9 and table 7. Value of “Pitch Wheel Range“ parameter is set
temporarily – valid till the next change of the controller or till the instrument switch off.
Table 7 – CC 17 values conversion to “VCO Pitch Bend Range“ parameter
CC Range CC Range CC Range CC Range
0 ~ 9 ±0 40 ~ 49 ±4 70 ~ 79 ±7 100 ~ 109 ±10
10 ~ 19 ±1 50 ~ 59 ±5 80 ~ 89 ±8 110 ~ 119 ±11
20 ~ 29 ±2 60 ~ 69 ±6 90 ~ 99 ±9 120 ~ 127 ±12
30 ~ 39 ±3
Pic. 9 – CC 17 value conversion to parameter values “VCO Pitch Bend Range“
11
10
6
2
0
4
8
012710 20 30 40 50 60 70 80 90 100 110 120
1
3
9
5
7
1
2
V
alue o
f
CC 17
"
V
CO Pitch Bend Range"
(in semitones)
CC 18 – Own controller : VCF Mode
Received value of the controller sets the value of the parameter “VCF Mode“ accordingly to the
pic. 10 and table 8. “VCF Mode“ parameter value is set temporarily – valid till the next change of the
controller or till the instrument switch off.
Table 8 – CC 18 values conversion to ”VCF Mode“ parameter
CC Mode CC Mode CC Mode
0 ~ 42 EG 43 ~ 85 Gate 86~ 127 Controller
Pic. 10 – CC 18 values conversion to the value of the “VCF Mode“ parameter

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
18
CC 19 – Own controller: VCF Key Follow
Received value of the controller 0 - 127 sets directly the value of the parameter “VCF Key
Follow“. “VCF Key Follow“ parameter value is set temporarily – valid till the next change of the
controller or till the instrument switch off.
CC 20 – Own controller: VCF Velocity Amount
Received value of the controller 0 - 127 sets directly the value of the parameter “VCF Velocity
Amount“. “VCF Velocity Amount“ parameter value is set temporarily – valid till the next change of the
controller or till the instrument switch off.
CC 21 – Own controller: VCF Chnl Aftertouch Amount
Received value of the controller 0 - 127 sets directly the value of the parameter “VCF Chnl
Aftertouch Amount“. “VCF Chnl Aftertouch Amount“ parameter value is set temporarily – valid till the
next change of the controller or till the instrument switch off.
CC 22 – Own controller: VCA Mode
Received value of the controller is converted to the value of the parameter “VCA Mode“
accordingly to the pic.11 and table 9. “VCA Mode“ parameter value is set temporarily – valid till the
next change of the controller or till the instrument switch off.
Table 9 – CC 22 values conversion to ”VCA Mode“ parameter
CC Mode CC Mode CC Mode
0 ~ 42 EG 43 ~ 85 Gate 86~ 127 Controller
Pic. 11 – CC 22 values conversion to the value of “VCA Mode“ parameter
CC 23 – Own controller: VCA Key Follow
Received value of the controller 0 - 127 sets directly the value of the parameter “VCA Key
Follow“. “VCA Key Follow“ parameter value is set temporarily – valid till the next change of the
controller or till the instrument switch off.
CC 24 – Own controller: VCA Velocity Amount
Received value of the controller 0 - 127 sets directly the value of the parameter “VCA Velocity
Amount“. “VCA Velocity Amount“ parameter value is set temporarily – valid till the next change of the
controller or till the instrument switch off.
CC 25 – Own controller: VCA Chnl Aftertouch Amount
Received value of the controller 0 - 127 sets directly the value of the parameter “VCA Chnl
Aftertouch Amount“. “VCA Chnl Aftertouch Amount“ parameter value is set temporarily – valid till the
next change of the controller or till the instrument switch off.

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
19
CC 26 – Own controller: EG Retrigger Mode
Received value of the controller is converted to the value of the parameter “EG Retrigger Mode“
accordingly to the pic.12 and table 10. “EG Retrigger Mode“ parameter value is set temporarily – valid
till the next change of the controller or till the instrument switch off.
Table 10 – CC 26 values conversion to “EG Retrigger Mode“
CC Mode CC Mode CC Mode
0 ~ 42 Off 43 ~ 85 Fix 86~ 127 MIDI
Pic. 12 – CC 26 values conversion to the ”EG Retrigger Mode“parameter values
CC 27 – Own controller: EG Retrigger Rate
Received value of the controller 0 - 127 sets directly the value of the parameter “EG Retrigger
Rate“. “EG Retrigger Rate“ parameter value is set temporarily – valid till the next change of the
controller or till the instrument switch off.
CC 28 – Own controller: Indicator Mode
Received value of the controller is converted to the value of the parameter “Indicator Mode“
accordingly to the pic.13 and table 11. “Indicator Mode“ parameter value is set temporarily – valid till
the next change of the controller or till the instrument switch off.
Table 11 – CC 28 values conversion to “Indicator Mode“
CC Mode CC Mode CC Mode CC Mode
0 ~ 31 Off 32 ~ 63 MIDI 64 ~ 95 Gate 96~ 127 Retrigger
Pic. 13 – CC 28 values conversion to the “Indicator Mode“ parameter values

VS-MIDI MIDI Interface for Vermona Synthesizer Model 8-434 ver. 1.0
Copyri ght © 2009 CHD Elektroservis
All rights reserved. No part of this publication may be reproduced in any form without the written permi ssion of CHD Elektroservis.
20
CC @ VCF CC Nr. – VCF Direct Control
Controller selected by the system parameter “VCF CC Nr.“ controls VCF of the instrument
directly if the VCF works in “Controller“ mode (accordingly to the preset parameter “VCF Mode“).
CC @ VCA CC Nr. – VCA Direct Control
Controller selected by the system parameter “VCA CC Nr.“ controls VCA of the instrument
directly if the VCA works in “Controller“ mode (accordingly to the preset parameter “VCA Mode“).
4.1.3. CHANNEL AFTERTOUCH
“Channel Aftertouch“ command affects VCF and VCA of the instrument accordingly to the
settings of preset parameters “VCF Chnl Aftertouch Amount“ and “VCA Chnl Aftertouch Amount“.
However the command is ignored when VCF and VCA work in “Controller“ mode.
4.1.4. PITCH BEND
“Pitch Bend“ command has standard function – it detunes the VCO of the instrument. The range
of the “Pitch Bend“ is defined by the “VCO Pitch Bend Range“ parameter and can be in the interval of
±0 to ±12 semitones.
The pitch shift range of the VCO might be limited upwards for the highest octave and the total
pitch shift is limited to approx four tones. This limitation is done by the construction of the Vermona
Synthesizer and can’t be removed.
4.1.5. PROGRAM CHANGE
“Program Change“ command switches the user presets of the interface. Numbers from 0 to 31
are accepted and they correspond to presets from Nr. 1 to Nr. 32.
Always when the “Program Change” is accepted, the VCO is muted and envelope generator
(EG) is switched off. When the next MIDI “Note-On“ command is received the interface starts to work
normally accordingly to the parameters of new preset.
4.2. SYSTEM COMMANDS
4.2.1. MIDI CLOCK
“MIDI Clock“ commands synchronizes the interval of the EG retrigger of the instrument if it works
in “MIDI“ mode (see preset parameter “EG Retrigger Mode“).
Maximal speed is limited by the hardware construction of the instrument. This may also cause
that when the MIDI song has very high tempo, the synchronized EG retrigger might be irregular.
4.2.2. RESET
When the “Reset“ command is received, a complete interface hardware reset is executed – all
Vermona Synthesizer circuits are set to their default status, same as after instrument switch on.