This is a bare PCB for the MIDIpal MIDI Processor - a multi-effect operating on MIDI data! It features 19 different MIDI “apps”, ranging from MIDI debugging or routing utilities (monitoring messages, remapping a channel to another one, etc.) to complex compositional tools like arpeggiators or pattern generators.

Incoming and outgoing MIDI signals are visualized by the red and green LEDs near the MIDI sockets.

The 8 characters LCD display is used to display the name and value of the currently edited parameter. Editing is done with the clickable rotary encoder.

Compositional aids

Keyboard-controlled drums sequencer. Control a drum module from a keyboard by triggering and combining patterns — one for each key of a 49 keys keyboard. Create mesmerizing Euclidean drum patterns.

Note randomizer: Randomize note values, velocity, and send random CC at each key press.

Chord memory: Enjoy the classic chord memory feature of early 80s synths.

Arpeggiator: Arpeggiate your chords. 4 modes (up, down, up&down, random), 15 rhythmic patterns, adjustable tempo, rhythmical division, gate and groove, syncable to MIDI clock.

Delay: Up to 32 echoes added after each note, transposition and velocity adjustment for creating feedback arpeggio effects, syncable to MIDI clock.

Scale: Never miss a note in a solo… The scale mapper replaces each note you play by its nearest neighbour in one of the 25 preset scales.

Step sequencer: The tiniest step sequencer! Up to 32 step can be sequenced, with note duration, note value, velocity, and CC control at each step.

MIDI message generation

Clock: Make your MIDI setup groove! MIDI clock source with adjustable tempo and adjustable groove/shuffle/humanization patterns, from super-tight to funky.

CC LFO: Generate up to 4 tempo-synced LFO and cyclic automation movements for any MIDI Control Change (CC) message.

CC knob: Use the MIDIpal as a knob to send any CC or NRPN message.

Controller: Up to 8 sensors / potentiometers (or any voltage source) can be connected to the MIDIpal board, turning it into a versatile “brain” for sensing applications.

Ear training game: A fun note / interval recognition game.

MIDI control

Monitor: Sometimes things go wrong with a MIDI setup… Use the MIDIpal as a trusted source to display the stream of MIDI messages coming from a cable.

BPM counter: Use the MIDIpal to check the accuracy of a MIDI clock signal coming from a sequencer or drum machine.

Channel filter: Remove all MIDI messages coming from a specific channel.

Splitter: Control several synths from a single keyboard by routing one half of the keyboard to a MIDI channel, the other half to another.

Dispatcher: Play a rack of monophonic synths like a polysynth. The MIDIpal will automatically route each note of a chord to a different MIDI channel.

Channel Merger: Merge several MIDI channels into a single MIDI stream.

Clock divider: Create a slower subdivision of a MIDI clock.