linearrr

Linear MIDI sequencer with locators and p-locks. Sister app to rrresponseq — full-song linear composition in the style of the Yamaha QX3 / MMT-8 / MPC step recording.

• Step input and real-time recording
• Locators navigable by resolution (1/1 to 1/128, dotted and triplets)
• Per-event p-locks (hold a note + turn a knob to edit)
• MIDI and Sampler tracks (internal audio engine with pitch shift, reverse, attack/release, gate)
• Tracker-style operations over selection or bars: reverse, stretch, shift, vel_ramp, humanize, scale_quantize, thin, double_oct, legato, gate_scale, chop, sample_start, attack, release
• JJOS-style modal for every operation
• Footer layout inspired by the QX3 JOB COMMAND TABLE

Stack

Python + Flask + SSE + inline HTML. No frontend dependencies.

Requirements

• Python 3.10–3.12 (do not use 3.13+ — python-rtmidi currently crashes on newer versions)
• macOS (tested), Linux (untested)
• Optional: MIDI controller (Launchkey, nanoKONTROL, etc.)

Install

python3 -m venv .venv
.venv/bin/pip install flask python-rtmidi sounddevice soundfile numpy

Run

./run.sh           # default browser
./run_app.sh       # Chrome in --app mode (no chrome UI)

Then open http://localhost:5002.

MIDI configuration

Edit config.py with your MIDI port names (MIDI_OUT_PORT, MIDI_KB_PORT, NK_IN_PORT).

License

PolyForm Noncommercial 1.0.0 — use, modification and distribution are allowed for noncommercial purposes only. For commercial use, please contact the author.