MPA open-sourced, on sale

The complete design (PCB, bill of materials, firmware source code) for the MPA MIDI decoder has been posted under the Creative Commons Attribution-ShareAlike license. The source files can be found at the MPA support forum.

The MPA has been placed on sale at the Highly Liquid Store and will be discontinued after remaining inventory has been depleted.

The MPA (MIDI potentiometer array) is a general-purpose MIDI decoder with 8 independent 5V logic outputs and 4 independent digital potentiometer outputs.


MIDISpeak, MIDI2600 Open-Sourced

The complete designs (PCB, bill of materials, firmware source code) for the discontinued MIDISpeak and MIDI2600 products have been posted under the Creative Commons Attribution license.  The license allows anyone to manufacture these products for personal use or for profit.

The source files can be found at the Highly Liquid Forum:

For those interested in Atari 2600 retrofits, the MD24 (joystick control) or UMR2 (keypad control) can be used.

NTH Music Synthesizer Available Now at

The NTH is a fun-to-use, sonically-rich, hackable music synthesizer.  It features digital oscillators, an analog low-pass filter, an integrated step sequencer, MIDI I/O, and simple, intuitive controls.

NTH Music Synthesizer

The NTH is available for purchase from February 2, 2012 to March 1, 2012 via Kickstarter:

Upon successful funding, production of the NTH will begin and the entire design will be open-sourced.

Audio examples, product photos, and additional documentation can be found at the NTH website:

The NTH was designed by Kevin Holland ( and John Staskevich (