The Audiothingies Midibro - Compact DIY MIDI Event Processor

via Audiothingies
via @FlavioB

"Built upon the acclaimed and now discontinued MIDIpal by Mutable Instruments, the Midibro is a smart and small MIDI processor available as a DIY kit.
Insert it between a MIDI keyboard (or sequencer) and a MIDI sound module to unleash powerful compositional tools and effects.

The most versatile MIDI event processor

Compositional tools

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.
Step sequencer: Record step-by-step a sequence of up to 128 notes (with ties, rests, slides and accents), and play it back with transposition. As simple and elegant as the classic SH-101 sequencer!
Randomizer: Randomize note values, velocity, and send random CC at each key press.
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.
Chord memory: Enjoy the classic *chord memory* feature of early 80s synths.
Delay. Up to 32 echo notes added after each note, transposition and velocity adjustment for creating feedback arpeggio effects, syncable to MIDI clock.
Scale processor. 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. It can also transpose and add voicing/random harmonies.
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 LFOs and cyclic automation movements for any MIDI Control Change (CC) message.
CC knob: Use the Midibro as a knob to send any CC or NRPN message.
MIDI setup plumbing

Dispatcher: Play a rack of monophonic synths like a polysynth. The Midibro will automatically route each note of a chord to a different MIDI channel.
Monitor: Sometimes things go wrong with a MIDI setup… Use the Midibro as a trusted source to display the stream of MIDI messages coming from a cable.
BPM counter: Use the Midibro to check the accuracy of a MIDI clock signal coming from a sequencer or drum machine.
Splitter: Control several synths from a single keyboard by routing one half of the keyboard to a MIDI channel, the other half to another.
Channel filter: Remove all MIDI messages coming from a specific channel.
Channel Merger: Merge several MIDI channels into a single MIDI stream.
Clock divider generates a slower subdivision of a MIDI clock.
The Midibro can also store 4 custom MIDI transform setups, each of them made of up to 4 filtering/remapping rules.

Other features

The Midibro is fully compatible with the original MIDIpal, meaning it is able to run all the different available MIDIpal firmwares.
As a consequence, its source code is open source and easily modifiable… So why not use it to implement your own MIDI transformation features?
The Midibro is open hardware.
Differences vs original MIDIpal

There are no differences if you plan to use the Midibro “as-is”.
If you plan to hack it, note that there are a few minor differences :

Only 6 internal analog inputs are available for hacking (vs 8)
An EEPROM can be added (tho not supplied in the kit) to store more settings (sequences, etc…). Beware: this needs firmware hacks."