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PadSeq

64-step drum sequencer LV2 plugin for Novation Launchpad Mini MK3

PadSeq turns the full 8x8 Launchpad grid into a 64-step drum sequencer with 8 voices, per-step velocity, Euclidean pattern generation, and two pattern slots (A/B). It follows the host transport and outputs MIDI notes on channel 10 for routing into any drum instrument.

Features

  • 64-step grid: every pad is a step (rows 0-7, cols 0-7)
  • 8 drum voices: selectable via side buttons, each with its own pattern
  • Velocity steps: step velocity uses incoming pad velocity
  • Euclidean sequencing: pulses + offset per voice
  • Pattern A/B: instant switching with preserved state
  • Active columns: shrink/expand sequence length (1-8 columns)
  • Launchpad LED feedback: playhead + active steps + mode buttons
  • X11/Cairo UI: mirrors Launchpad state and allows mouse interaction

Building

cmake -S lv2/padseq -B lv2/padseq/build
cmake --build lv2/padseq/build
cmake --install lv2/padseq/build --prefix ~/.lv2

Verify:

lv2ls | grep padseq
lv2info https://danja.github.io/flues/plugins/padseq

Usage

DAW Routing (Reaper Example)

  1. Insert PadSeq on a MIDI track.
  2. Route Launchpad Mini MK3 DAW port:
    • Launchpad DAW Out → PadSeq Control In
    • PadSeq Launchpad Control → Launchpad DAW In
  3. Route PadSeq MIDI Out to your drum instrument.
  4. Start the host transport; PadSeq follows tempo and play/stop.

Controls

Top row (CC 91-99):

  • 91: Euclid pulses up (current voice)
  • 92: Euclid offset up (current voice)
  • 93: Active columns down (1-8)
  • 94: Active columns up (1-8)
  • 95: Pattern A
  • 96: Pattern B
  • 97: Clear current voice + Euclid
  • 98: Clear pattern + Euclid
  • 99 (logo): Clear pattern + Euclid

Side buttons (CC 19-89):

  • Select drum voice 0-7 (top to bottom)
  • Default MIDI notes per voice: 36, 40, 39, 50, 42, 46, 53, 51

Grid (8x8):

  • Tap to toggle steps for the selected voice
  • Yellow = active step, Gray = inactive columns, Green = playhead

Architecture

lv2/padseq/
├── include/                # Launchpad + engine headers
├── src/                    # Engine + LV2 wrapper + X11/Cairo UI
├── padseq.lv2/             # LV2 metadata
├── docs/                   # User manual + test guides
└── README.md

Notes

  • PadSeq outputs MIDI only (audio outputs are silent).
  • Transport sync uses time:Position from the host.
  • If the Launchpad is not routed to the control ports, LEDs will stay dark.