92 Quattro Formaggio
Quattro Formaggio maps USB MIDI to calibrated CV/Gate plus audio (121-patch voice matrix + ADSR), with host SETUP/MIDI-learn for CC/knob maps (voice, envelope, cutoff, PWM), stroke LED feedback, and a web editor in device mode.
Panel
SETUP slot selectAttack (factory)Release (factory)Not usedNot usedNot usedNot usedNot usedNot usedAudio mix LAudio mix RPitch Voice APitch Voice BGate Voice AGate Voice BControls
SETUP slot select
In SETUP, selects learn slot 0–12; no function in PLAY
Attack (factory)
Factory-mapped to Attack; re-learnable in SETUP to any slot
Release (factory)
Factory-mapped to Release; re-learnable in SETUP to any slot
Save SETUP exit: In SETUP, move Z Up then Middle to save maps to flash and return to PLAY
Save SETUP (from Up): In SETUP, reached after Z Up — completes save to flash and returns to PLAY
SETUP toggle / factory reset: Hold ~1 s to toggle SETUP while running (host or device+relay); hold ~0.1 s at power-on for factory reset
Inputs & Outputs
Inputs
Outputs
Inputs
Not used
No audio input processing in current firmware
Not used
No audio input processing in current firmware
Not used
CV inputs are not mapped in current firmware
Not used
CV inputs are not mapped in current firmware
Not used
Pulse inputs are not mapped in current firmware
Not used
Pulse inputs are not mapped in current firmware
Outputs
Audio mix L
4-voice poly (engines 0–12); Junoish can be stereo via per-voice chorus; full-level audio (external mixer)
Audio mix R
Right mix (stereo for Junoish chorus; otherwise matches L)
Pitch Voice A
v/Oct for voice A (default MIDI ch 1), last-note priority; C4 = 0 V
Pitch Voice B
v/Oct for voice B (default MIDI ch 2), C4 = 0 V, with pitch bend
Gate Voice A
Gate for voice A
Gate Voice B
Gate for voice B, last-note priority
LEDs
Status / SETUP bit0 / glyph
Host mount or device blink in PLAY; SETUP slot LSB; stroke glyphs on change
Activity / SETUP bit1 / glyph
MIDI activity in PLAY; SETUP slot bit1; stroke glyphs
Gate 1 / SETUP bit2 / glyph
Pulse Out 1 in PLAY; SETUP slot bit2; stroke glyphs
Gate 2 / SETUP bit3 / glyph
Pulse Out 2 in PLAY; SETUP slot bit3; stroke glyphs
SETUP blink A / web / glyph
Alternates with LED5 in SETUP; web-linked in PLAY device mode; stroke glyphs
SETUP blink B / saved / glyph
Alternates with LED4 in SETUP; brief flash after flash save in PLAY; stroke glyphs
README
Plug a class-compliant USB MIDI keyboard into the Computer (Rev 1.1+) for dual-voice CV/gate plus 4-voice poly audio (121-patch voice matrix). CC 24 selects engine patch. Hold Z Down ~1 s to toggle SETUP and learn any CC, key, or X/Y knob to a parameter slot. Plug into a laptop to use web/index.html for the same maps over SysEx. Full operator docs: docs/getting-started.md