MidiGAL is yet another MIDI controller device inspired by Mutable Instruments MIDIpal.


Although MidiGAL can run Mutable Instruments MIDIpal firmware, there is a number of other firmware variants that were developed specifically for MidiGAL:

  • MidiClk — MIDI clock tester/generator
  • MidiArp — advanced MIDI arpeggiator
  • MidiSeq — polyphonic MIDI step sequencer
  • MidiDisp — MIDI events dispatcher
  • MidiClock — MIDI Clock tester
  • MidiSync — MIDI Clock generator
  • MidiGrids — Mutable Instruments Grids for MIDI (experimental)

MidiGAL differences from MIDIpal

While MidiGAL hardware is almost identical to the original MIDIpal, there are some minor differences:

  • 8×2 LCD (MIDIpal uses 8×1)
  • tactile switch (MIDIpal has no switch)
  • external EEPROM (MIDIpal has no external EEPROM)
  • 4 x I/O ports (MIDIpal has 8 of them)

DIY Resources

Firmware:  MidiClk_099  MidiArp_097 MidiSeq_097c MidiDisp_100 MIDIpal_v1.4

Bill of materials: MidiGAL BOM

Build instructions: Building MidiGAL

Schematics: midigal_sch

Board outline: midigal_dim, SMT: midigal_smd_top  midigal_smd_bottom

Case files: MidiGAL_Case_4 (thanks to Altitude909)

Test firmware with source code: MidiGAL_src (good starting point if you want to develop your own MIDI processing firmware for MidiGAL)


Acrylic case


This case requires 4 x 10mm (top) and 4 x 22mm (bottom) standoffs.

It is compatible with both long (25mm) and short (20mm) shaft encoders. Long encoder works with pretty much any 6mm D-shaft knob, whereas the short one needs a knob with 8mm skirt or less.

It expects rectangular switch button, the one that is specified in the BOM (TACBLK)

The .EPS file is formatted for Ponoko/Formular but any place should be able to accept it.

Ordering MidiGAL

To order MidiGAL, please send an email to pete at kvitek c o m specifying how many PCBs and pre-programmed MCUs you need, a country where to ship them, and an email address to send the PayPal invoice to.

MidiGAL PCB — $20

Pre-programmed ATMega328p — $10 (please specify the firmware variant)

Acrylic case with all the required hardware (stand offs, screws, nuts and rubber legs): — $30

Continental USA — $5 (California residents add 8.75% tax)
Canada — $10
Europe — $15
Australia — $15

Please make sure your PayPal shipping address is correct!

If you don’t trust your soldering skills, we can build a MidiGAL or two for you. The order is usually fulfilled in a couple of days. Fully assembled MidiGAL in an acrylic case is $145 plus shipping, please email pete at kvitek c o m for details if you are interested.


Starting with March 2018, all fully assembled MidiGALs are SMT, unless you request otherwise. MidiGAL SMT is functionally identical to its original through hole variant and has exactly the same form factor:



134 thoughts on “MidiGAL

  1. Hello, Pete!
    Is it possible to use your prom files to program the atmega myself? Is there any pitfalls on this way or I have to buy the preprogrammed MC from you?

    • Absolutely! Flashing MCUs is pretty straighforward once you’ve figured it out. The only pitfall I can think of is choosing an unreliable programmer. I’m using original AVR ISP Mk2 and it’s excellent.

  2. Hello

    its possible to use these one woth hhe Korg MS20m Kit version to simulated a polyphon mode with dispatching?

    I have a MidiPal but the dispatch dont work woth the ms20m kit.

    • Since KORG MS-20M allows you to select MIDI Channel it receives notes on should be able to use a group of MS-20Ms set to different MIDI Channels as a single poly synth by using either MIDIpal “dispatch” app or MidiGALs MidiDispatch firmware.

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