Universal Audio OX Stomp — MIDI Editor & CC Reference
Control the Universal Audio OX Stomp from your browser — MIDI control reference, interactive editor, and AI-generated presets. Free, no install.
Explore the OX Stomp 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 |
|---|---|---|
| ROOM | CC 35 | Amount of mic'd studio ambience and air. Increase for more room ambience, decrease for a drier, close-mic'd tone. |
| SPEAKER DRIVE | CC 21 | Dynamic response and breakup of the speaker cabinet. At low settings the cab sounds like a new speaker; raising it makes the cab softer and spongier with more breakup. At higher ranges, breakup is more obvious. At the top, the speaker approaches end-of-life — weaker, looser, darker, with possible sub-octave cone cry. |
| OUTPUT | CC 7 | Pedal output level. OX Stomp's output is intentionally lower than other UAFX pedals to preserve the headroom of its complex modeling; typically unity lands between 3 o'clock and maximum. |
| MIC 1 | CC 23 | Level of Mic 1 in the overall pedal mix. |
| RIG | CC 2 | Selects one of six Rigs assigned to the Rig knob positions in the UAFX Control app. Factory defaults: 1 = 4x12 Green Punch, 2 = 1x12 50s Twang, 3 = 2x12 Honkin Silvers, 4 = 4x10 Pristine Clean Room, 5 = 1x10 Roomy Tiny Combo, 6 = 2x12 Comfortable Lead. For full access to all 128 Rig slots, use MIDI Program Change. Note: the Rig knob is hardware-only and does not transmit on a real MIDI CC (this CC assignment is a display placeholder). |
| MIC 2 | CC 29 | Level of Mic 2 in the overall pedal mix. |
Switches
| Switch | MIDI CC | Positions |
|---|---|---|
| MIC 1 SELECT | CC 22 | Dynamic 421 / Dynamic 57 / Condenser 414 / Ribbon 160 / Ribbon 121 / Condenser 67 / Direct Box |
| MIC 2 SELECT | CC 28 | Dynamic 421 / Dynamic 57 / Condenser 414 / Ribbon 160 / Ribbon 121 / Condenser 67 / Direct Box |
| CABINET | CC 20 | 1x10 Black Cha / 1x12 Black GB30 / 1x12 Black D-UX / 1x12 JBG125 / 1x12 Blu 15 / 1x12 GB25 / 1x12 Blue J / 2x10 V-UX / 2x12 Ace Top / 2x12 Alnico 50 / 2x12 Black 8h / 2x12 D65 / 2x12 Two Verb / 2x12 JBF120 / 4x10 BMan / 4x12 GB30 |
| ROOM MIC | CC 34 | Condenser Stereo / Ribbon Stereo / Condenser Mono / Condenser 67 Mono / Ribbon 84 Mono / Ribbon 121 Mono |
Footswitches
- A — CC 12
- B — CC 13
Special MIDI Functions
- Delay Enable — CC 40. Toggles the master delay effect on/off independent of the Rig's stored state.
- Reverb Enable — CC 60. Toggles the master plate reverb on/off independent of the Rig's stored state.
- Mic 1 Mute — CC 25. Mutes Mic 1 without changing its level.
- Mic 1 On Axis — CC 26. Sets Mic 1 on-axis (127) or off-axis (0). Off-axis softens the top end and tames presence.
- Mic 1 Low Cut — CC 27. Engages a low-cut filter on Mic 1. Helpful with condensers on bassy cabs.
- Mic 2 Mute — CC 31. Mutes Mic 2 without changing its level.
- Mic 2 On Axis — CC 32. Sets Mic 2 on-axis (127) or off-axis (0).
- Mic 2 Low Cut — CC 33. Engages a low-cut filter on Mic 2.
- Room Mute — CC 37. Mutes the room mic(s) without changing the Room knob.
- Room Damp — CC 38. Adds baffles and carpeting to the room to tighten and even out the room sound (Damped mode vs. Live).
- Room Low Cut — CC 39. Engages a low-cut filter on the room mic(s).
- Delay Time — CC 41. Master delay time (0.14 ms to 3 s depending on the delay type).
- Delay Feedback — CC 42. Master delay feedback (-100% to +100%). Positive feedback is typical for delays; negative feedback gives more interesting chorus/flanger results.
- Delay Mix — CC 44. Master delay dry/wet mix. Fully wet = only the delayed signal.
- Reverb Decay — CC 61. Master plate reverb decay time (0.5 s to 5.5 s).
- Reverb Mix — CC 63. Master plate reverb dry/wet mix. OX Stomp's reverb is 15% wet at the halfway point to allow finer control over lower mix settings.
- Mic 1 Pan — CC 24. Stereo panning of Mic 1 (0 = hard left, 64 = center, 127 = hard right).
- Mic 2 Pan — CC 30. Stereo panning of Mic 2 (0 = hard left, 64 = center, 127 = hard right).
- Room Pan — CC 36. Stereo panning of the room mic(s).
Hardware Presets
OX Stomp has 128 hardware preset slots, recalled using MIDI Program Change. Saving requires an action on the pedal; follow the hardware preset manager instructions.