Universal Audio Ruby '63 — MIDI Editor & CC Reference
Control the Universal Audio Ruby '63 from your browser — MIDI control reference, interactive editor, and AI-generated presets. Free, no install.
Explore the Ruby '63 controls in your browser and connect compatible MIDI hardware to send settings to your pedal. The reference below shows the controls mapped in Nitelite; available functions depend on the pedal and firmware. The default MIDI channel in Nitelite is 1. Browser MIDI control works in Chrome, Edge, Opera, or Brave — no install required.
Knobs
| Control | MIDI CC | Description |
|---|---|---|
| VOLUME | CC 22 | Amp gain. As volume increases, the amp becomes more overdriven and compressed. Even at minimum the amp is still audible — output is automatically compensated as Volume is raised. |
| CUT | CC 36 | Power-amp high-frequency filter. Turning the knob clockwise reduces high frequencies and darkens the amp tone. The UAFX range is expanded over the original (which had a narrow sweet spot). |
| OUTPUT | CC 7 | Post-amp output level. At noon, running direct or into other pedals, level is roughly the same as bypassed volume. Not available on the original amp. |
| BASS | CC 31 | Reduces the low-frequency response of the amp's tone stack — works in reverse of most EQ knobs (higher value = more cut). Active only on the Brilliant channel; the Speaker LED blinks rapidly to indicate the knob is inactive on Normal or Vibrato channels. |
| TREBLE | CC 33 | Reduces the high-frequency response of the amp's tone stack — works in reverse of most EQ knobs (higher value = more cut). Active only on the Brilliant channel. Interacts strongly with Bass: both fully up creates an extreme 'smiley-face' EQ; both near noon gives the fullest, most natural midrange. |
| BOOST | CC 41 | Boost amount. 0 (OFF) disables the boost circuitry entirely. Character depends on the Channel switch: Brilliant adds EP-III tape-echo preamp gain, Normal adds a Dallas Rangemaster-style germanium treble booster, Vibrato adds clean boost with a slight mid/treble lift and bass tightening. |
Alt / Secondary Knob Functions
| Control | MIDI CC | Description |
|---|---|---|
| ROOM | CC 30 | Room ambience amount (ALT mode on the Bass knob). Mixes room microphones from a tracking room into the cabinet signal. Only affects the sound when a speaker cabinet is active — has no effect when the Speaker LED is off (No Cab) or in 4-cable mode. |
| SPEED | CC 61 | Vibrato rate (ALT mode on the Treble knob). Only active on the Vibrato channel. The pedal's vibrato speed range extends slower than the original amp. |
| INTENSITY | CC 62 | Vibrato intensity / harmonic contour (ALT mode on the Boost knob). 0 bypasses the vibrato circuit. Only active on the Vibrato channel. Lower settings yield harmonic tremolo-type tones; higher settings produce more aggressive volume-tremolo character. |
Switches
| Switch | MIDI CC | Positions |
|---|---|---|
| SPEAKER | CC 18 | Silver / Blue / Green / Blue Mod / Match / Gold / No Cab |
| CHANNEL | CC 17 | BRIL / NORM / VIB |
Footswitches
- ON — CC 12
- PRESET — CC 13
Special MIDI Functions
- Boost Enable — CC 40. Toggles the boost circuit on/off independent of the Boost knob position.
- Vibrato Enable — CC 60. Toggles the vibrato circuit on/off. Vibrato is only available when the Vibrato (VIB) channel is selected.
- Speaker Up — CC 14. Cycles the Speaker switch up through the cab list (momentary).
- Speaker Down — CC 15. Cycles the Speaker switch down through the cab list (momentary).
- Store Preset (Hold) — CC 16. Emulates holding the ALT/AMP/STORE switch. Sends value 1 to save the current Live-mode settings to the currently selected preset slot.
Hardware Presets
Ruby '63 has 128 hardware preset slots, recalled using MIDI Program Change. Saving requires an action on the pedal; follow the hardware preset manager instructions.