Documentation Index
Fetch the complete documentation index at: https://mintlify.com/gueritta/primemixxx/llms.txt
Use this file to discover all available pages before exploring further.
The Denon Prime Go exposes all physical controls — platters, faders, pads, buttons, and encoders — as an internal USB MIDI device. The authoritative source for the hardware’s MIDI layout is the Engine OS QML file at /usr/Engine/AssignmentFiles/PresetAssignmentFiles/JP11/JP11_Controller_Assignments.qml on the device. The MIXXX mapping files Denon-Prime-Go.midi.xml and Denon-Prime-Go-scripts.js must match these channel, note, and CC assignments exactly.
Engine OS QML files use 0-indexed MIDI channels (0 = channel 1). MIXXX uses the standard 1-indexed status byte convention (0x90 = channel 1, Note On). When comparing the QML source against MIXXX XML entries, add 1 to the QML channel index to get the MIXXX channel number.
Never delete .midi.xml files during cleanup. If the file referenced by [ControllerPreset] in mixxx.cfg is missing, MIXXX skips controller initialization entirely and the skin renders only a toolbar — decks, waveforms, and the library are all hidden.
Channel Layout
| MIDI Channel | QML Index | Purpose |
|---|
| 1 | 0 | Mixer Channel 1 (PFL, EQ, fader, sweep FX) |
| 2 | 1 | Mixer Channel 2 (PFL, EQ, fader, sweep FX) |
| 3 | 2 | Left Deck (transport, pads, jog, tempo) |
| 4 | 3 | Right Deck (transport, pads, jog, tempo) |
| 5 | 4 | DJ FX (select, time, wet/dry, activate) |
| 16 | 15 | Global (back, forward, browse, view, shift, load) |
Left Deck — MIDI Channel 3
Note On status byte: 0x92 — Note Off: 0x82
Notes
| Control | Note (dec) | Note (hex) | Notes |
|---|
| Load | 1 | 0x01 | |
| Sync | 8 | 0x08 | Hold = KeySync |
| Cue | 9 | 0x09 | Shift = Set Cue Point |
| Play | 10 | 0x0A | |
| Pad Mode CUES | 11 | 0x0B | Alt = STEMS |
| Pad Mode LOOPS | 12 | 0x0C | Alt = AUTO |
| Pad Mode ROLL | 13 | 0x0D | Shift = SAMPLER |
| Action Pads 1–8 | 15–22 | 0x0F–0x16 | 8 velocity-sensitive pads |
| Pitch Bend − | 29 | 0x1D | |
| Pitch Bend + | 30 | 0x1E | |
| Jog Touch | 33 | 0x21 | |
| Vinyl | 35 | 0x23 | Hold = GridCueEdit, Shift = SlipMode |
| AutoLoop Push | 39 | 0x27 | Shift = IncreaseBeatJumpSize |
CCs
| Control | CC (hex) | Notes |
|---|
| Tempo Slider Upper | 0x1F | Inverted |
| Tempo Slider Lower | 0x4B | |
| AutoLoop Turn | 0x20 | Shift = BeatJump |
| Jog Wheel MSB | 0x37 | Upper 7 bits of 14-bit position |
| Jog Wheel LSB | 0x4D | Lower 7 bits of 14-bit position |
Right Deck — MIDI Channel 4
Note On status byte: 0x93 — Note Off: 0x83
Same note and CC layout as the Left Deck, with one exception:
| Control | Note (dec) | Note (hex) |
|---|
| Load | 2 | 0x02 |
Mixer Channel 1 — MIDI Channel 1
Note On status byte: 0x90 — Note Off: 0x80
| Control | Type | Value (hex) |
|---|
| PFL (Cue Monitor) | Note | 0x0D |
| Sweep FX Select 1 | Note | 0x0E |
| Sweep FX Select 2 | Note | 0x0F |
| Trim (Gain) | CC | 0x03 |
| Treble (High EQ) | CC | 0x04 |
| Mid EQ | CC | 0x06 |
| Bass (Low EQ) | CC | 0x08 |
| Sweep FX Knob | CC | 0x0B |
| Channel Fader | CC | 0x0E |
| VU Meter (output) | CC | 0x20 |
Mixer Channel 2 — MIDI Channel 2
Note On status byte: 0x91 — Note Off: 0x81
Same layout as Mixer Channel 1. VU Meter output uses CC 0x21 instead of 0x20.
DJ FX — MIDI Channel 5
Note On status byte: 0x94
| Control | Type | Value (hex) |
|---|
| FX Activate | Note | 0x06 |
| FX Select Push | Note | 0x07 |
| FX Time Push | Note | 0x08 |
| FX Select Touch | Note | 0x09 |
| FX Assign 1 | Note | 0x0B |
| FX Assign 2 | Note | 0x0C |
| FX Wet/Dry | CC | 0x04 |
| FX Select Turn | CC | 0x21 |
| FX Time Turn | CC | 0x22 |
Global — MIDI Channel 16
Note On status byte: 0x9F — Note Off: 0x8F
| Control | Type | Value (hex) | Notes |
|---|
| Back | Note | 0x03 | |
| Forward | Note | 0x04 | Shift = Quantize |
| Browse Encoder Push | Note | 0x06 | |
| View | Note | 0x07 | Hold = ControlCenter, Shift = SwitchLayout |
| Shift | Note | 0x08 | |
| Eject/Source | Note | 0x14 | Shift = Source select |
| Browse Encoder Turn | CC | 0x05 | Shift = 15-step scroll |
| Cue Mix | CC | 0x0C | |
| Cue Gain | CC | 0x0D | |
| Crossfader | CC | 0x0E | |
Mic Controls (Global channel)
| Control | Note (hex) |
|---|
| Mic 1 | 0x24 |
| Mic 2 | 0x25 |
Jog Wheel Details
Each deck exposes the jog wheel across three messages on its deck MIDI channel:
| Signal | Type | Value (hex) | Purpose |
|---|
| Jog Touch | Note | 0x21 | Triggers engine.scratchEnable() |
| Jog Wheel MSB | CC | 0x37 | Upper 7 bits of 14-bit position |
| Jog Wheel LSB | CC | 0x4D | Lower 7 bits of 14-bit position |
isPress()) and vinylMode === true. The default value of _vinylMode is true. The Vinyl button (Note 0x23) edge-detects transitions from 0 → 127 to toggle vinyl mode on/off.
LED Protocols
SysEx RGB (LedType.RGB)
Used for pad buttons (Action Pads 0x0F–0x16) and pad mode buttons (HotCue/Loop/Roll mode keys).
F0 00 02 0B 7F 0C 03 00 05 <ch> <idx> <r> <g> <b> F7
<ch> and <idx> are the MIDI channel and note index in hex<r>, <g>, <b> are 7-bit (0–127) gamma-corrected color values- Gamma: 3.5 (same value used for both pad and non-pad controls)
- Color calculation:
Math.floor(Math.pow(c, gamma) * 127) where c is a normalized 0–1 float
const sendSysexRGB = function(channel, control, red, green, blue) {
const msg = [0xf0, 0x00, 0x02, 0x0b, 0x7f, 0x0C, 0x03, 0x00, 0x05,
channel, control, red, green, blue, 0xf7];
midi.sendSysexMsg(msg, msg.length);
};
Simple Note On/Off (LedType.Simple)
Used for transport buttons (Play, Cue, Load), navigation (Back, Forward, Browse, View, Shift), PFL, AutoLoop, and Vinyl.
Note On: 9<ch> <idx> <vel> (vel > 0 → LED on, color = velocity)
Note Off: 8<ch> <idx> 00 (vel = 0 → LED fully off)
Known Working Simple LED Color Values
| Value | Color / Effect | Used For |
|---|
0x00 | Fully off | Cue off, Play off, PFL off |
0x01 | Very dim glow | Load (empty slot) |
0x02 | Subtle dim | Back, Forward (always lit) |
0x09 | Dim yellow | Shift off |
0x0C | Green | Play on, Load (track loaded) |
0x1A | Amber / orange | Cue on |
0x20 | Bright green | Sync on |
0x40 | Red | Vinyl on |
1–8 | Deck colors | PFL on (colDeck = [1, 5], colDeckDark = [4, 6]) |
Device Init SysEx Messages
These messages are sent on controller connection to initialize the hardware:
F0 00 02 0B 7F 0C 60 00 04 04 01 01 04 F7 (device initialization)
F0 00 02 0B 7F 0C 04 00 00 F7 (query absolute controls)
F0 00 02 0B 7F 0C 42 00 00 F7 (request power-on button state)
F0 7E 00 06 01 F7 (MIDI device inquiry)
All Known SysEx Messages
| Name | Message |
|---|
| RGB LED color | F0 00 02 0B 7F 0C 03 00 05 <ch> <idx> <r> <g> <b> F7 |
| Device initialization | F0 00 02 0B 7F 0C 60 00 04 04 01 01 04 F7 |
| Query absolute controls | F0 00 02 0B 7F 0C 04 00 00 F7 |
| Request power-on state | F0 00 02 0B 7F 0C 42 00 00 F7 |
| MIDI device inquiry | F0 7E 00 06 01 F7 |
f_midi virtual device for Serato loopback compatibility.
Known Issues
| Issue | Status | Notes |
|---|
| PFL left always on | ✅ Fixed | output() sends 0x00 (Note Off) instead of dim green |
| Vinyl rapid toggle | ✅ Fixed | Edge detection: _lastVinylState, only 0→127 triggers |
| Cue LED | ✅ Fixed | Simple Note On (0x1A) works |
| Play LED | ✅ Fixed | Simple Note On (0x0C) works |
scratch2_enable Channel0 error | ✅ Fixed | Removed outKey from vinyl button |
| Pad / hotcue LEDs | ❌ Broken | Only update on pad mode switch, not on track load |
| Jog touch error | ❌ Open | vinylMode may be false; needs debug |
| Load / Back / Fwd LEDs | ❌ Open | Still use SysEx or no output — need Simple |
