ModyPoly for Poly-61M

This is a quick manual how to install the ModyPoly in an Korg Poly-61M. The existing midi sockets are used, so no new holes have to be drilled. Incomming midi messages are passed to both the original midi implementation and the ModyPoly. Outgoing midi messages will be from ModyPoly only.

  1.  Install the ModyPoly as shown in the installation manual. Do not drill any holes for the midi sockets.
  2. Cut off the ModyPoly midi sockets.
  3. From the existing midi sockets, remove the red wire and solder the purple wire from ModyPoly in its place as shown in image 1 below. This takes care of the midi output.
  4. For the midi input you need the following additional parts: A NPN Transistor such as BC547C, a 100k resistor and a 10k resistor. These parts need to be soldered to the PC-900 optocoupler found on the Poly-61 midi board as shown in schematic figure 2 and picture 3. Solder the black and white wires from ModyPoly to the points shown in the schematic.

You can now use your ModyPoly. There is only one detail you need to be aware of:

ModyPoly uses Program Change midi messages to switch Play modes, the Poly-61M uses them (correctly) to switch programs. So make sure you have the Poly-61M midi receive channel set to a different number then the ModyPoly midi receive channel.

Image 1, midi socket connection

Image 3

Schematic 2


Midi for Korg Minipops 7 (uniPulse installation)

This guide shows you how to use the Tubbutec uniPulse interface with a Korg Minipops 7.

The config file for the Korg Minipops 7 is here.


– Full velocity control for all 14 instruments
– Velocity controls guiro pitch
– Midi sync (optional)

Trigger points:

The image below shows the trigger points. You can solder the uniPulse trigger outs directly to these points. An exception is the Guiro, which is connected to the uniPulse CV-out with an additional diode.

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SH-1oh1 µTune edition now available


The SH-1oh1 µTune is a special edition of the Tubbutec SH-1oh1. It has all the features of the SH-1oh1 but also:

  • Microtuning with high resolution
  • Upload up to 31 custom scales via midi sysex. For example using Scala.
  • Switch scales live
  • Includes a scale editor! For each key you can set base note, coarse and fine pitch via midi CC. Save your custom scale when satisfied.
  • Export scales via midi-sysex, or send them to other synths
  • Custom tuning available on CV-out (5 octaves only)

The SH-1oh1 µTune special edition is hand assembled and tested in our workshop.

The user manual can be found here: SH-1oh1 µTune user manual (PDF) (Chapter 8 describes µTune features)

The installation manual can be found here: SH-1oh1 µTune installation manual (PDF)

You can order the SH-1oh1 µTune in our shop.


Polysex now open source hardware


Tubbutec Polysex is discontinued but we decided to make all the design files available to the public as open hardware. You can still purchase the PCBs in our shop.

The files include front panel mechanical drawings and print data, schematics and PCB layout, the mechanical stencil design and manuals.

If you use or modify this, please be so kind and leave a comment below. We also like pictures and videos 🙂

You can download the files as .ZIP here: Tubbutec Polysex design files.

Files are licensed under the CERN OHL v. 1.2.

Juno-66 update – now features custom scales


Juno-66 firmware version 1.24 is released. Apart from the seven built in scales,  is now possible to upload a four custom scales using a program like Scala. Of course micro tuning is supported and you can have any number of notes per octave. Have a look at the user manual (chapter 10) for details.

In case you missed previous firmware updates, here are a few of the new features since the initial 1.00 release:

  • New school chord memory modes
  • Optional auto portamento in MONO B mode
  • Three voice mode
  • Looping mode, delay and polarity for ADSR

More infos about the Juno-66 upgrade on the Juno-66 product page.