MIDI Kit for Korg Monotribe This board enables MIDI functionalities

MIDI Kit for Korg Monotribe
This board enables MIDI functionalities in Korg Monotribe.
Based in Gameboy Genius documentation, to take advantage of hidden features in this
machine.
Three versions are available:
A - External. Solderless and no drilling.
B - Internal. Solderless. No drilling also possible but recommended.
C - Do it yourself! PCB, componenets and assembly instructions provided.
Features at a glance:
- Note ON/OFF, LFO parameters and EG control in synth part
- Sequencing via MIDI for drum section.
- MIDI Sync IN and OUT.
- Sends MIDI OUT for synth part parameters and drums separetly.
- Works as MIDI clock to Sync and Sync to MIDI clock converter.
A - EXTERNAL VERSION
WARNING: Opening Monotribe voids it's warranty. We do not take responsability of any harm done to de
device due to unsuitable handling.
1 – Remove rubber feet and take the four screws out.
2 – Take out the connector between mAin board and power case.
3 – Locate Serial port and plug cable provided.
4 – Take the wires out. We suggest two differnent ways to avoid drilling the box.
4.1 – Through speaker holes.
Unscrew speaker and pass wires through the greed. This will leave a good wire's lenght
out of the box.
4.2 – Through battery compartment.
Pass wires through battery compartment hole. This will avoid it to close anymore.
5 – Close monotribe, reversing procedure.
6 – Connect wires to the Board following this order:
White – Red – Yellow - Orange
B – INTERNAL VERSION
1 – Follow steps 1, 2 y 3 from external kit section.
2 – DIN5 connectors are pre-wired. MIDI IN one has two wires, MIDI OUT three. This is
DIN5 pinout.
3 – Board wiring Diagram:
We recommend to drill the case to accomodate DIN5 connectors, although you might
follow step 4 in internal Kit version to avoid drilling.
C - Do It Yourself!
WARNING: Soldering to Monotribe's board could harm the unit if not done carefully. Advanced skills
recommended. We do not take responsability for incorrect handling beyond these instructions.
Part list and location in board:
R2,R3,R5
R1
D1
OPTO
150 ohm (Might be 180 ohm , depending batch)
4K7
1N4148 (Mind the black stripe in the diode)
6N136 (Dot in IC marks orientation)
Monotribe Connector
Solder cables to X5 pads in following order: WHITE, RED, YELLOW, ORANGE
Connect cables to Serial port following this pinout and avobe color schema.
1 – Orange (GND)
2 – Yellow (VCC)
3 – White (MIDI OUT)
4 – Red (MIDI IN)
Orientative description. Better
to solder under the board.
DIN5 MIDI Connectors
MIDI IN y MIDI OUIT are written in the board as IN and OUT. Solder cables minding
pinout.
MIDI Features
WARNING: MIDI feature is unsupported by Korg and has some limitations.
Synchronisation and sequencer.
Receives and sends MIDI clock and start/stop. These can be combined with Monotribe's
Sync IN/OUT to act as a MIDI clock to sync or sync to MIDI clock converter.
Records notes from MIDI in into internal sequencer memory. Synth section works as an
arpeggiator, storing pitch information in sequencer's steps, to control external devices.
Synth steps will be sent via MIDI even if step is disabled. You'll need to use the ribbon +
“Active Step” to control volume in each step.
External devices must accept Volume Controller - CC 7 (applicable only in Firmware v2)
KNOWN ISSUES: After using MIDI as clock source, if sync IN wants to be used, Monotribe
need to be reseted. This is a design Limitation.
Drum Section
Drum section is triggered via MIDI channel 10.
Name
Nº Note
Name
Drum Name
BD
36
C1
Bass drum 1
SN
40
E1
Snare dum 2/Electric snare
HH
42
F#1
Closed hi-hat
Both MIDI IN and OUT uses this channel and same notes.
Synth section.
NoteON/OFF via channel MIDI 1
KNOWN ISSUES: A note could be stuck if a note OFF message is not received. Some
devices and software can send several differnet note ON but not a NOTE OFF for every
note sent.
Clicking sound is Monotribe's design limitation and cannot be avoided.
Control change messages (CC)
Name
LFO rate
LFO int.
EG shape
CC
16
1
80
LFO target
81
LFO mode
82
LFO wave
83
VCA Level*
7
11
Value
–
–
32=decay
64=sustain
96=attack
32=VCO
64=VCO+VCF
96=VCF
32=Fast
64=Slow
96=1shot
32=Saw
64=Triangle
96=Square
-
Parameter
Control general 1
Modulación
Control general 5
Control general 6
Control general 7
Control general 8
Volume or Expression
MIDI Velocity to
VCA LEVEL*
* Only available in Firmware version 2.0
Acknowledgments, Credits, info and Kudos!
No rights reserved. This board wouldn't have been possible without the information
posted by Gameboy Genius and Muffwiggler forum members.
All Kudos for them.
If you want to make this board from scratch, download eagle file here:
http://famfest.info/eagle/MIDITRIBE.ZIP
All needed information:
http://blog.gg8.se/wordpress/2011/08/14/monotribe-midi-and-me/
http://www.muffwiggler.com/forum/viewtopic.php?t=39099
http://famfest.info
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