Tubbutec SH-1oh1 User manual

Tubbutec SH-1oh1
Midi retrofit and feature extension for Roland SH-101
User Manual v1.1
http://tubbutec.de
1

Contents
Contents 2
1 SH-1oh1 4
2 Accent 4
3 Improved sequencer 5
3.1 Newfeatures .......................... 5
3.2 Recording a sequence . . . . . . . . . . . . . . . . . . . . . . 5
3.3 Playingasequence ....................... 6
3.3.1 Playing directions . . . . . . . . . . . . . . . . . . . . 6
3.3.2 Shiftsequence...................... 6
3.4 Continue recording a sequence . . . . . . . . . . . . . . . . . 6
3.5 Switchsequence......................... 7
3.5.1 Select sequence to play . . . . . . . . . . . . . . . . . 7
3.5.2 Change playing sequence at the end of the current one 7
3.5.3 Change playing sequence instantly . . . . . . . . . . 7
3.6 Record and play a song . . . . . . . . . . . . . . . . . . . . . 7
4 Additional filter ADSR envelope 8
5 Additional filter LFO 8
6 Arpeggiator, sequencer and random-LFO clocks 9
6.1 MIDI clock dividers . . . . . . . . . . . . . . . . . . . . . . . 10
6.2 ARP, SEQ and RANDOM clock divider . . . . . . . . . . . 11
6.3 Sensitivity............................ 11
7 Improved arpeggiator 12
8 Extended pitch range 12
2

CONTENTS 3
9 MIDI 13
9.1 MIDIin ............................. 13
9.2 MIDIout ............................ 13
9.2.1 MIDI out as played . . . . . . . . . . . . . . . . . . . 14
9.2.2 MIDI out as sounds . . . . . . . . . . . . . . . . . . . 14
9.3 MIDIController......................... 14
9.4 Saving MIDI parameters . . . . . . . . . . . . . . . . . . . . 15
9.5 Velocity mapping . . . . . . . . . . . . . . . . . . . . . . . . 16
9.5.1 None........................... 16
9.5.2 Cutoff .......................... 16
9.5.3 Volume accent amount . . . . . . . . . . . . . . . . . 16
9.5.4 Filter accent amount . . . . . . . . . . . . . . . . . . 16
9.5.5 Accentswitch...................... 16
9.5.6 Attack, decay, sustain or release . . . . . . . . . . . . 17
9.6 MIDImerger .......................... 17
9.7 Control SH-101 buttons . . . . . . . . . . . . . . . . . . . . 17
10 Config menu 18
10.1 Enter and exit the config menu . . . . . . . . . . . . . . . . 18
10.2 Using the config menu . . . . . . . . . . . . . . . . . . . . . 18
10.2.1 UPpage......................... 19
10.2.2 U&Dpage........................ 19
11 Appendix 20
11.1 MIDI controller chart . . . . . . . . . . . . . . . . . . . . . . 20
11.2Latency ............................. 21
11.3Thanks.............................. 22

42. ACCENT
1 SH-1oh1
The SH-1oh1 is a MIDI retrofit and feature extension for the Roland SH-
101 synthesizer. This manual only describes the features that differ from
those of the original SH-101. Great care has been taken to avoid altering
the original behavior of the synth while only adding features on top.
2 Accent
While the siblings of the SH-101 – the MC-202 and TB-303 – both have
this feature, which is important to many musical styles, it was unfortunately
lacking in the SH-101. . . until now!
The SH-1oh1 accent consists of an envelope with a fixed fast attack and a
decay adjustable between one millisecond and five seconds. It can be routed
to the VCA, filter or both while the amount can be adjusted individually.
The accent can be programmed in the sequencer or triggered via MIDI
velocity in various ways.
Accents give the SH-101 new possibilities in terms of expression and
variation.
See chapters ’Improved sequencer’ and ’MIDI’ for information on how

5
AMOUNT
TIME
Accent decay
Filter
VCA
CV
Amount
Switch
Amount
Switch
+
+
Figure 1: Accent flow chart
to trigger and program the accent.
3 Improved sequencer
3.1 New features
While the original SH-101 sequencer features one sequence with a maxi-
mum of 100 steps, the SH-1oh1 provides 32 sequences with 120 steps each.
Additionally the sequences can be chained to create a song. This can be
done live while an other song is playing. Each step of a sequence can be ei-
ther a rest or a note. Additional attributes can be assigned to notes: glide,
volume accent and filter accent. These attributes can also be combined.
Despite the vastly improved functionality, a user who has experience with
the original SH-101 can still use the sequencer as they did originally.
3.2 Recording a sequence
To record a sequence press the LOAD button. This will select the last
sequence used for editing. To select a different sequence for editing, instead
of pressing LOAD, press and hold LOAD and use the keyboard to select
a sequence. Each of the 32 keyboard keys has a sequence assigned to it.
Release the LOAD button to start recording.

63. IMPROVED SEQUENCER
You can now enter notes by using the keyboard.
Additional attributes can be added to a note by first pressing an assigned
button:
press HOLD for a glide, UP for volume accent and U&D for filter accent.
The LEDs above the buttons will light up to indicate the attribute’s state.
Press the same button again to remove the attribute. When you are fin-
ished selecting the attributes press a keyboard key to save the next step.
You will hear the note including the attributes (except glide). Press KEY
TRANSPOSE to enter a rest.
To delete the last step press DOWN. SH-1oh1 now plays the new final note
of the sequence.
The sequence is saved in the SH-1oh1 memory and will be available again
after power up even without a battery or external power supply.
3.3 Playing a sequence
To play a previously recorded sequence press PLAY.
3.3.1 Playing directions
You can use the UP, U&D and DOWN buttons to change the direction in
which the sequence is playing. Press DOWN and U&D simultaneously to
play the sequence in a random order.
3.3.2 Shift sequence
While a sequence is playing it can also be triggered manually and shifted
forward or backward. This is very useful when syncing the SH-1oh1 to an
external clock to adjust the start of a sequence. This function can also be
used as a performance tool, by shifting the sequence while it is playing to
create variation.
Press KEY TRANSPOSE and hold it. Now press UP to trigger the se-
quence one step forward, and press DOWN to trigger it one step backward.
3.4 Continue recording a sequence
If you want to continue recording a sequence, press LOAD while it is playing.
The sequence will stop playing and you can add or delete steps.

3.5. SWITCH SEQUENCE 7
3.5 Switch sequence
The SH-1oh1 features 32 different sequences with 120 steps each. Each of
the 32 keyboard keys has a sequence assigned to it.
3.5.1 Select sequence to play
Press and hold PLAY and press one of the keyboard keys to select a se-
quence.
If the sequencer was inactive it will begin playing the new sequence as soon
as you release the PLAY button.
3.5.2 Change playing sequence at the end of the current one
To change a sequence at the end of the one currently playing press and
hold PLAY and press the assigned keyboard key for the new sequence.
After releasing the PLAY button the current sequence will play until it
ends, followed by the new sequence, which will start from the beginning.
3.5.3 Change playing sequence instantly
While the sequencer is playing you can also change the sequence instantly
by pressing the corresponding keyboard key. The new sequence will not
start from the beginning, but instead will be synced to the playing one.
Synchronization is guaranteed as long as the two sequences have lengths
which are multiples of each other. For example 8 and 4 or 6 and 12, and so
on.
3.6 Record and play a song
You can chain up to 120 sequences to create a song. To record a song press
and hold PLAY and press the keyboard keys in the order you want the
sequences to be chained in. You can also select a single sequence multiple
times. If another song is currently playing, it will continue to play until you
release the PLAY button. After this, the currently playing sequence will

85. ADDITIONAL FILTER LFO
play until it ends and the first sequence of the new song begin.
4 Additional filter ADSR envelope
The SH-1oh1 features an additional ADSR envelope for the filter.
The envelope parameters - attack, decay, sustain, release and amount - can
be controlled via MIDI controller messages. See the MIDI controller chart
in the appendix.
The range of these parameters is very wide: from a few milliseconds on the
low end up to six seconds on the longest setting. The parameter control
law is logarithmic to ensure good control over the whole range.
The envelope does not retrigger if you play legato, in a similar fashion to
the ’GATE’ setting on the SH-101’s envelope selector.
AMOUNT
TIME
A D S R
Figure 2: ADSR overview
5 Additional filter LFO
The SH-1oh1 features an additional LFO for the filter which outputs a
triangular waveform. Its frequency can be adjusted from 0.12 Hz - 8

9
0 20 40 60 80 100 120
0
1
2
3
4
5
6
Midi value
Time [s]
Figure 3: Attack, Decay and Release times and their corresponding MIDI
controller values
kHz using a fine and coarse control. High LFO frequencies sound especially
interesting with a high resonance setting. The amount can also be adjusted.
See the MIDI controller chart for corresponding controller numbers.
6 Arpeggiator, sequencer and
random-LFO clocks
The ’RANDOM LFO’ mentioned in this paragraph refers to the ’RANDOM’
setting in the SH-101’s MODULATOR section. In other words, it’s one of
4 LFO types in the stock SH-101. It is not to be confused with additional

10 6. ARPEGGIATOR, SEQUENCER AND RANDOM-LFO CLOCKS
filter LFO described in chapter 5.
The SH-1oh1 sequencer, arpeggiator and ‘RANDOM’ LFO mode (and
only the RANDOM mode) can be clocked by multiple sources: the internal
LFO or external trigger input, MIDI clock, or MIDI notes.
Additionally, clock dividers are built in for these clock sources. This means
that you can, for example, have the ‘RANDOM’ LFO synced to the internal
LFO clock, while the arpeggiator is clocked at half its speed, the sequencer
is synced to MIDI 16th and the ‘random LFO triggered by an external
trigger signal.
There are four clock dividers: ARP / SEQ MIDI clock divider, ARP / SEQ
clock divider, RANDOM MIDI clock divider and RANDOM clock divider.
These are used depending on which sources are selected.
The figure below shows an overview of the general clock flow.
SELECTOR
/N
DIVIDER
/N
DIVIDER
/N
DIVIDER
/N
DIVIDER
MIDI
NOTE 0
MIDI
CLOCK
EXT CLOCK IN / LFO CLOCK
ARP and SEQ RANDOM LFO
SELECTOR
MIDI
NOTE 1
Figure 4: Arpeggiator, sequencer and random-LFO clock flow chart
The clock sources and divider settings can be made using the config
menu or via MIDI.
6.1 MIDI clock dividers
The table below shows the possible dividers for the MIDI clock and their
MIDI controller values. When changing the divider a special algorithm
ensures that the clock stays in sync.

6.2. ARP, SEQ AND RANDOM CLOCK DIVIDER 11
Ctrl val 0-7 8-15 16-23 24-31 32-39 40-47 48-55 56-63
Bars 2.5 2 1.5 1 3
41T 1 2
3
8
Ctrl val 64-71 72-79 80-87 88-95 96-103 104-111 112-119 120-127
Bars 1
2T1 4
3
16
1
4T1 8
1
8T1 16
1
32
Table 1: MIDI controller settings for ARP, SEQ and RANDOM MIDI clock
divider
6.2 ARP, SEQ and RANDOM clock divider
In addition to the MIDI clock divider there is a second set of dividers used
for the internal LFO clock and the EXT CLK input. Using MIDI, the
dividers can be adjusted from 1 to 192 with the following mapping: divider
= Controller value + 1, with the following exceptions: MIDI value 126 is
mapped to 128 and MIDI value 127 to 192. This is to make sure the useful
values of 128 and 192 are included.
The divider can also be used to clock the SH-1oh1 to an external DIN-SYNC
clock. Divider factors useful for this purpose are included. The table below
shows the divider factors selectable via the config menu with a few selected
DIN24 values.
Divider 1 2 3 4 5 6 7 8
DIN24 1
96
1
48
1
32
1
24
1
16
Divider 10 12 14 16 24 36 48 96 192
DIN24 1
8
1
6
1
4
3
8
1
21 2
Table 2: Divider factors for clock dividers and their DIN24 meaning
6.3 Sensitivity
When triggering the arpeggiator or sequencer from an external source such
as an other sequencer, a modular system or an audio output, double trig-
gerings can occur if the trigger signal is not conditioned properly. A typical
example would be triggering the sequencer with the audio out of a drum
machine.
On the other hand very fast triggers or clocks are sometimes desirable,
a typical example being a DIN-SYNC clock in combination with the SH-
1oh1’s internal clock divider.

12 8. EXTENDED PITCH RANGE
Time in ms 0 6 13 19 26 32 38 45 51 58 64 70 77 83 90 96 102
Frequency in Hz max 156 78 52 39 31 26 22 20 17 15.6 14.2 13 12 11 10.4 9.8
SYNC24 BPM max 390 195 130 97 78 65 56 49 43 39 35.5 32.6 30 27.9 26 24.4
Table 3: Possible hold-off times and their corresponding clock frequencies
and SYNC24 BPM values
To avoid double triggerings in one scenario but allow fast triggers in
another, an additional parameter is introduced: the trigger hold off. After
a trigger has occurred, the next is only allowed after a certain amount of
time has passed. The hold-off time can be adjusted in the config menu and
is by default set to a value of 26ms, allowing the internal LFO to trigger at
its maximum speed.
When using a SYNC24 clock with more then 97BPM as external trigger,
the hold off time needs to be reduced or turned off completely.
When using an audio signal as a trigger, it is recommended to increase
the hold-off time to avoid double triggerings.
7 Improved arpeggiator
The existing arpeggiator has been slightly expanded. It now features a
random mode. You can access the random mode by pressing the DOWN
and U&D keys simultaneously.
It is now also possible to ’arpeggiate’ a single note. This differs from the
original SH-101, as here the envelope is retriggered on each arpeggiator
event.
8 Extended pitch range
Internally, the SH-101 has two different CVs (control voltages) for pitch.
Only one of these is routed to the CV OUT jack - this we will call CV1.

13
The other one is only available internally: CV2.
Before it is passed to the CV OUT jack and then back in over a switchable
connection to the CV IN jack, CV1 passes the portamento circuit where the
glide is added. After this both CVs are added and passed to the internal
VCO (voltage controlled oscillator).
Natively the SH-101 features a range of only 56 notes: the 32 notes of the
keyboard plus 2 octaves via the TRANSPOSE SWITCH. This is done using
CV1. The range is then further increased by adding the TRANSPOSE and
RANGE data via CV2 which is not available at the CV OUT jack.
The SH-1oh1 increased the number of notes available to 74.
MIDI control is available in the full 64-note range of CV1. It starts at
C2 instead of F2 and ends with D#7 instead of C7. It is then further in-
creased up to C9 by using CV2. However keep in mind that portamento is
not working properly in this range and the control voltage output by CV
OUT may distort. It is therefore recommended to use SH-1oh1 in the range
delimited by C2 and D#7.
9 MIDI
9.1 MIDI in
Depending on the MIDI setting (located in the config menu), the SH-1oh1
receives MIDI input on a single channel (1 - 16) or an all channels (omni).
It reacts to MIDI notes 24 - 96
9.2 MIDI out
The SH-1oh1 has two separate MIDI out modes and sends both on two
different MIDI channels simultaneously. You can configure the channel
numbers in the config menu or turn the channels off altogether.
The range of MIDI notes sent is 24 - 96.

14 9. MIDI
9.2.1 MIDI out as played
On the as-played channel only the key presses on the SH-101’s keyboard are
sent. If you record this channel and send its output back to the SH-1oh1,
the synth will sound exactly the same as when you played it.
This is useful for using SH-1oh1 as a MIDI keyboard. In this mode, HOLD
pedal events will be sent as sustain MIDI messages.
9.2.2 MIDI out as sounds
On the as-sounds channel instead of the key presses and releases, MIDI is
sent the way it actually sounds. In this mode the SH-1oh1 will output the
arpeggiator, sequencer and normal play mode including retrigger informa-
tion. Sustain events will not be sent as MIDI messages but rather simulated
with note on and off events.
Portamento / glide will be sent as the new note turning on before the old
one turns off. Most synths understand this as a glide command.
9.3 MIDI Controller
Most of the SH-1oh1 parameters can be controlled via MIDI controller
messages. The table below shows the parameters and their MIDI controller
numbers. These need to be sent on the correct MIDI in channel.
Note: controller numbers in the chart are in the range of 0-127. If your
MIDI controller displays controller numbers as 1-128, you must add 1 to
the numbers below.

9.4. SAVING MIDI PARAMETERS 15
Controller number Usage Range
16 Filter cutoff 0-127
17 ARP/SEQ MIDI divider 0-127 *see table 1
18 ARP/SEQ clock divider 0-127
19 S/H LFO MIDI divider 0-127 *see table 1
20 S/H LFO clock divider 0-127
21 ARP/SEQ clock source 0-127
22 S/H clock source 0-127
23 Triangular LFO frequency coarse 0-127
24 Triangular LFO frequency fine 0-127
25 Triangular LFO amount 0-127
26 Filter ADSR attack 0-127
27 Filter ADSR decay 0-127
28 Filter ADSR sustain 0-127
29 Filter ADSR release 0-127
30 Filter ADSR amount 0-127
31 Accent decay 0-127
32 Accent volume amount 0-127
33 Accent filter amount 0-127
34 Velocity mapping See chart below
120 All sound off -
123 All notes off -
Velocity mapping
Value 0..13 14..27 28..41 42..55 56..69 70..83 84..97 98..111 112..127
Mapping None Cutoff Vol Acc Amt F Acc Amt Acc SW ATT DEC SUS REL
Table 4: MIDI in controller numbers chart
9.4 Saving MIDI parameters
Normally values you have changed using MIDI are not saved and will be
lost after a power down. You can however save them manually. To do this,
enter the config menu (see config menu chapter), go to the U&D page and
press one of the unused buttons. All parameters except ADSR and LFO
will be saved.

16 9. MIDI
9.5 Velocity mapping
The velocity information of a MIDI note on event can be mapped to a variety
of targets in the SH-1oh1. The mapping can be configured in the config
menu or by using MIDI controller number 34. For details, see the MIDI
controller chart above or in the appendix. By default, velocity mapping is
set to ’Accent switch’
9.5.1 None
MIDI velocity is not mapped to any parameter.
9.5.2 Cutoff
MIDI velocity is mapped to filter cutoff. The velocity value is added to the
existing cutoff value.
9.5.3 Volume accent amount
MIDI velocity is mapped to volume accent amount. If this is activated, the
accent is triggered each time a note-on event is received, and the accent
volume amount is defined by velocity. The filter accent will keep the value
last set.
9.5.4 Filter accent amount
MIDI velocity is mapped to filter accent amount. If this is activated, the
accent is triggered each time a note-on event is received and the accent filter
amount is defined by velocity. The volume accent will keep the value last
set.
9.5.5 Accent switch
The velocity value controls the triggering of filter and volume accent while
their amounts remain unchanged. Mapping is as follows:
Velocity value 0-31 32-62 63-93 94-127
Triggered accent None Volume Filter Volume & filter
Table 5: Accent-switch mapping

9.6. MIDI MERGER 17
9.5.6 Attack, decay, sustain or release
The velocity controls one of the four parameters of the additional filter
ADSR while the other parameters remain unchanged.
9.6 MIDI merger
The SH-1oh1 includes a MIDI merger sometimes referred to as ’MIDI soft-
through’. When activated all in coming MIDI data is merged with the data
generated by the SH-1oh1 and passed to the MIDI output.
The merger consists of two modules. One passes MIDI data such as
note on and off, controller data, pitch bend and aftertouch messages. The
other passes real-time MIDI information such as MIDI clock, start and stop.
Both modules can be activated independently from each other in the config
menu. It is recommended to only turn on the merger if the functionality
is truly needed as more MIDI data also might mean larger latencies due to
the limitations of the MIDI protocol.
The MIDI clock module is optimized to handle clock data with a very
low latency and minimum jitter of only 0.35±0.0025 ms. Given the fact
that the length of one MIDI byte is around 0.3ms this is very close to the
theoretical minimum.
By default the MIDI merger is turned off.
9.7 Control SH-101 buttons
With this setting activated in the config menu, it is possible to send and
receive additional button presses as MIDI notes. Buttons such as LOAD or
DOWN can be controlled using the lowest MIDI octave and the SH-1oh1
also sends these events on the as-played channel.
By default sending and receiving button presses over MIDI is deacti-
vated.

18 10. CONFIG MENU
MIDI note Associated button / event (if activated)
0 / C0 ARP / SEQ clock event (if MIDI note is selected as clock source)
1 / C#0 RANDOM clock event (if MIDI note is selected as clock source)
2 / D0 TRANSPOSE switch
3 / D#0 TRANSPOSE switch
4 / E0
5 / F0 LOAD
6 / F#0 PLAY
7 / G0 DOWN
8 / G#0 U & D
9 / A0 UP
10 / A#0 HOLD
11 / B0 EXT HOLD
12 / C1 KEY TRANSPOSE
10 Config menu
The SH-1oh1’s internal config menu can be used to set many parameters
using the keyboard. The only exception are the settings of the triangular
LFO and the additional filter ADSR.
10.1 Enter and exit the config menu
To enter the config menu, press and hold KEY TRANSPOSE and press
HOLD. The KEY TRANSPOSE and HOLD LEDs will start blinking to
indicate that the config menu is activated.
To exit the config menu press either HOLD or KEY TRANSPOSE.
It is recommended to make sure that no MIDI note information is sent
on the SH-1oh1’s MIDI in channel when entering the config menu.
10.2 Using the config menu
The config menu is divided into two pages: the UP page and the U&D page.
By pressing the UP and U&D buttons you can switch between these two

10.2. USING THE CONFIG MENU 19
pages. Upon entering the config menu, the last page used will be active.
10.2.1 UP page
On the UP page, the lower 17 keys of the keyboard are used to select a
parameter’s value, and the rest are used to choose the parameter itself.
To set the value for a parameter, first press the key associated with the
parameter (such as ’MIDI-in channel’) and then press one of the value keys
to set its value (6, for example).
In this way, MIDI channels, clock dividers, accent parameters and ex-
ternal trigger sensitivity , can be set.
10.2.2 U&D page
On the U&D page further parameters can be controlled. Here MIDI veloc-
ity mapping, arpeggiator/sequencer clock source, random clock source and
MIDI merger settings can be controlled.
It is also possible to reset the firmware and all its settings to the default
values by pressing ’factory reset’.
’Pitch bend calibration’ is not needed by the user and only needs to be
performed once after installing the kit.

20 11. APPENDIX
0
OFF
OMNI
1
2
3
4
5
6 7
8
9
10
11 12
13
14
15
16
internall
internall
None/O
Cuto
Vol Acc
Filter Acc
Switch
Attack
Decay
Sustain
Release
m. clock m. clock
clock on
m. clock
m. note m. note
clock
o
data o
In
As-Played
A/S int.
Vol Amt
Decay
ext. trigger hold o
F amt
As-Spunds
MIDI
AMOUNT ACCENT
CLOCK
DIVIDERS
ARP/SEQ Midi
RANDOM Midi
RANDOM internal
pitch bend calibration
ARP/SEQ
Clock
source
RANDOM
Clock
source
MIDI
MERGER
SEND/
RECEIVE
BUTTONS
Velocity
Mapping
factory reset
clock divider
DIN24
midi clock
divider
1
2.5 1.52 1 1T
3
4
2 3 4 5 6 7 8 10 12 14 16 24 36 48 96 192
1/4 1/23/81/6 1/1 21/81/16
1/32
1
2
3
8
1
2
1
4
3
16
1
4
1
8
3
32
1
8
1
16
1
32
T
PAGE: UPPAGE: U&D
data on
OFF
ON
Figure 5: Config menu overview
11 Appendix
11.1 MIDI controller chart
Note: controller numbers in the chart are in the range of 0-127. If your
MIDI controller displays controller numbers as 1-128 you must add 1 to the
numbers below.