(On the Arduino Mega) 8-stage Loopable Control Envelope and Random/S&H LFO
(On the Arduino Mega) Keyboard Splitter
(On the Arduino Mega) Channel Merging, Chord Memory, Debouncing, Multichannel Note Distribution, Channel Blocking, and Note Replication
(On the Arduino Mega) Measure and Beat Counter
(On the Arduino Mega) MIDI NRPN/CC/Sysex Converters for Blofeld, Matrix 1000, Microsampler, and TX81Z
MIDI In and Out
NRPN, CC, and by-Note Control of Gizmo
Tempo and Note Speed
MIDI Clock Control, Filtering, and Division
(On the Arduino Mega) Transposition and Volume Modulation
(On the Arduino Mega) Output to 0-5V DC Control Voltage (V/Octave with Gate and auxillary voltage for velocity or pressure)
Storage for 10 Arpeggios and 2 (Uno) or 9 (Mega) Sequences / Recordings
Have an Uno but want a feature only available on the Mega? No problem! Gizmo is fully modular: you can customize the board to add or remove applications or features as you like.
Gizmo's LED display is rock-solid, steady bright red. But in these videos it looks like flickery, junky yellow due to the camera. :-( Annoying. Note: these demos were of Version 1: there have been improvements since.
Optional voltage output is done via two I2C-based DACs. Gizmo targets these 12-bit DACs from Adafruit. You'll also need more wires (of course) and perhaps a breadboard to make things easy. Warning: the voltage code has not been tested at all yet.
If you're thinking of doing development for the Gizmo, you should do it on an Arduino Mega. At present Gizmo takes up all but just a few bytes of the Arduino Uno's memory: there's no space left to code.