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ØMX-27 is a DIY hardware MIDI controller and sequencer with RGB LED backlit mechanical key switches.

Features

• 27 RGB backlit mechanical key switches
• 5 Potentiometers
• 1 Encoder (w/ switch)
• OLED display (32x128)
• USB-MIDI
• Hardware MIDI Out (1/8" minijack, Type A/B switchable)
• CV pitch and CV Gate outputs
• Teensy 3.2 microcontroller

Power/data from 5V micro-USB into Teensy on right-hand side.

Hardware MIDI output has a toggle switch to allow you to swap between A - 'Arturia/Novation' (tip is current source) and B - 'Korg/Makenoise' (ring is current source) standards. Keyplate is labelled such.

Software Modes

(modes are still work in progress and subject to change)

MIDI keyboard

sends USB-MIDI and hardware MIDI notes along with 5 CC’s.
sends CV pitch and CV gate (limited to 4 octave range)

Sequencer 1 - single pattern

8 patterns of 16 steps
plays one pattern at a time
variable pattern length

Sequencer 2 - multi pattern

8 patterns of 16 steps
plays all patterns at the same time
variable pattern length (for each pattern)
(still lots to do in the sequencer code)