Universal Audio Astra — MIDI Editor & CC Reference
Control the Universal Audio Astra from your browser — MIDI control reference, interactive editor, and AI-generated presets. Free, no install.
Explore the Astra 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 |
|---|---|---|
| RATE | CC 23 | Modulation rate / LFO speed. Slower on the left, faster on the right. Meaning varies per mode (chorus speed / flanger sweep rate / tremolo rate). |
| DEPTH | CC 24 | Modulation depth. Meaning varies per mode (chorus/vibrato depth / flanger sweep range / tremolo intensity). |
| MIX | CC 22 | Dry/wet blend between the dry signal and the modulated signal. |
| COLOR | CC 26 | Mode-dependent coloration. Chorus Brigade: BBD tone / saturation. Flanger: feedback/resonance. Trem 65: waveform shape. |
| SHAPE | CC 27 | Mode-dependent LFO shape or secondary modulation parameter. |
Switches
| Switch | MIDI CC | Positions |
|---|---|---|
| MODE | CC 18 | Chorus Brigade / Flanger Doubler / Trem 65 |
| VARIANT | CC 17 | A / B |
Footswitches
- ON — CC 12
- PRESET — CC 13
Special MIDI Functions
- Effect Up — CC 14. Cycles the Mode switch up (momentary).
- Effect Down — CC 15. Cycles the Mode switch down (momentary).
- Store Preset (Hold) — CC 16. Saves current Live-mode settings to the active preset slot.
Hardware Presets
Astra has 128 hardware preset slots, recalled using MIDI Program Change. Saving requires an action on the pedal; follow the hardware preset manager instructions.