---

name: led-mapping-guide description: Visual guide for APC Mini MK2 LED and button mapping. Use when user needs to know "which button", "pad location", "LED position", "coordinate to note", "note to coordinate", or wants to understand the physical layout of the controller.

APC Mini MK2 LED Mapping Guide

Visual reference for button positions and their corresponding MIDI note numbers.

Physical Layout Overview

┌─────────────────────────────────────────────────────┐
│                                                     │
│  [SHIFT]                              [SCENE 1-8]   │
│                                         112-119     │
│  ┌───┬───┬───┬───┬───┬───┬───┬───┐    ┌───┐       │
│  │56 │57 │58 │59 │60 │61 │62 │63 │    │112│ Row 8  │
│  ├───┼───┼───┼───┼───┼───┼───┼───┤    ├───┤       │
│  │48 │49 │50 │51 │52 │53 │54 │55 │    │113│ Row 7  │
│  ├───┼───┼───┼───┼───┼───┼───┼───┤    ├───┤       │
│  │40 │41 │42 │43 │44 │45 │46 │47 │    │114│ Row 6  │
│  ├───┼───┼───┼───┼───┼───┼───┼───┤    ├───┤       │
│  │32 │33 │34 │35 │36 │37 │38 │39 │    │115│ Row 5  │
│  ├───┼───┼───┼───┼───┼───┼───┼───┤    ├───┤       │
│  │24 │25 │26 │27 │28 │29 │30 │31 │    │116│ Row 4  │
│  ├───┼───┼───┼───┼───┼───┼───┼───┤    ├───┤       │
│  │16 │17 │18 │19 │20 │21 │22 │23 │    │117│ Row 3  │
│  ├───┼───┼───┼───┼───┼───┼───┼───┤    ├───┤       │
│  │ 8 │ 9 │10 │11 │12 │13 │14 │15 │    │118│ Row 2  │
│  ├───┼───┼───┼───┼───┼───┼───┼───┤    ├───┤       │
│  │ 0 │ 1 │ 2 │ 3 │ 4 │ 5 │ 6 │ 7 │    │119│ Row 1  │
│  └───┴───┴───┴───┴───┴───┴───┴───┘    └───┘       │
│   C1  C2  C3  C4  C5  C6  C7  C8                   │
│                                                     │
│  ┌───┬───┬───┬───┬───┬───┬───┬───┐                │
│  │100│101│102│103│104│105│106│107│  [TRACK 1-8]   │
│  └───┴───┴───┴───┴───┴───┴───┴───┘                │
│                                                     │
│  ════════════════════════════════  [FADERS 1-9]    │
│   F1  F2  F3  F4  F5  F6  F7  F8  F9(Master)       │
│  CC48 CC49 CC50 CC51 CC52 CC53 CC54 CC55 CC56      │
│                                                     │
└─────────────────────────────────────────────────────┘

Pad Grid Mapping (Notes 0-63)

8x8 RGB pad matrix with full color support:

Row	Col 1	Col 2	Col 3	Col 4	Col 5	Col 6	Col 7	Col 8
8	56	57	58	59	60	61	62	63
7	48	49	50	51	52	53	54	55
6	40	41	42	43	44	45	46	47
5	32	33	34	35	36	37	38	39
4	24	25	26	27	28	29	30	31
3	16	17	18	19	20	21	22	23
2	8	9	10	11	12	13	14	15
1	0	1	2	3	4	5	6	7

Coordinate Conversion Functions

// Convert (row, column) to MIDI note (1-indexed coordinates)
function coordToNote(row: number, col: number): number {
  return (row - 1) * 8 + (col - 1);
}

// Convert MIDI note to (row, column) (1-indexed)
function noteToCoord(note: number): { row: number; col: number } {
  return {
    row: Math.floor(note / 8) + 1,
    col: (note % 8) + 1
  };
}

// Convert (x, y) to MIDI note (0-indexed coordinates)
function xyToNote(x: number, y: number): number {
  return y * 8 + x;
}

// Convert MIDI note to (x, y) (0-indexed)
function noteToXY(note: number): { x: number; y: number } {
  return {
    x: note % 8,
    y: Math.floor(note / 8)
  };
}

Track Buttons (Notes 100-107)

Bottom row, single-color red LEDs:

Button	Track 1	Track 2	Track 3	Track 4	Track 5	Track 6	Track 7	Track 8
Note	100	101	102	103	104	105	106	107
Hex	0x64	0x65	0x66	0x67	0x68	0x69	0x6A	0x6B

Velocity values:

• 0 = Off
• 1 = On
• 2 = Blink

Scene Launch Buttons (Notes 112-119)

Right column, single-color green LEDs:

Button	Scene 1	Scene 2	Scene 3	Scene 4	Scene 5	Scene 6	Scene 7	Scene 8
Note	112	113	114	115	116	117	118	119
Hex	0x70	0x71	0x72	0x73	0x74	0x75	0x76	0x77
Row	8	7	6	5	4	3	2	1

Velocity values:

• 0 = Off
• 1 = On
• 2 = Blink

Special Buttons

Button	Note	Hex	LED
Shift	122	0x7A	None

LED Types by Region

Region	Notes	LED Type	Colors
Pad Grid	0-63	RGB	128 palette + custom RGB
Track	100-107	Single	Red only
Scene	112-119	Single	Green only

Common Patterns

Light entire row

function lightRow(output: Output, row: number, velocity: number) {
  for (let col = 0; col < 8; col++) {
    const note = (row - 1) * 8 + col;
    output.send('noteon', { note, velocity, channel: 6 });
  }
}

Light entire column

function lightColumn(output: Output, col: number, velocity: number) {
  for (let row = 0; row < 8; row++) {
    const note = row * 8 + (col - 1);
    output.send('noteon', { note, velocity, channel: 6 });
  }
}

Light diagonal

function lightDiagonal(output: Output, velocity: number) {
  for (let i = 0; i < 8; i++) {
    const note = i * 8 + i;
    output.send('noteon', { note, velocity, channel: 6 });
  }
}

Clear all pads

function clearAllPads(output: Output) {
  for (let note = 0; note < 64; note++) {
    output.send('noteon', { note, velocity: 0, channel: 0 });
  }
}