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.