The Groovesizer RED is a DIY 16-step sequencer and granular synth. It’s based on the original Groovesizer mk1 Arduino project. It features 16 LEDs (one per step), 5 potentiometers, and 5 buttons, MIDI input and ouput on 5-pin DINs, MIDI sync in and out, and audio out (mono) on an 1/8″ jack. There are 32 user locations for saving patterns and patches. Up to 4 patterns can be chained together to create a 4 bar pattern. Note entry can be quantized to one of 12 pre-defined scales. Patterns can be triggered and transposed via MIDI. Notes can also be entered via an attached MIDI keyboard.

Links: Building instructions, Manual, Firmware, Design files

Features at a glance:

SYNTH - granular synth based on Auduino - synth settings saved with pattern - Live Play mode (via MIDI keyboard) - automatable grain decay 1 (sounds similar to filter cutoff)

SEQUENCER - note entry for individual steps or groups of up to 4 steps at once - rests, ties, slides and accents for each step - pattern length from 1 – 16 steps - pattern retrigger - tap tempo - 6 play modes (forward, reverse, pendulum, random interval, drunk, random) - pattern transpose (semitones or octaves) - adjustable note duration - swing/shuffle - MIDI in/out (note, clock sync, trigger) - MIDI note entry - MIDI transpose pattern - send automation via MIDI cc - note entry quantized to 12 preset or 4 user defined scales - 32 save locations arranged in 8 banks of 4 patterns - 4 play modes per bank (loop 1, loop 2, loop 4, random)