Plock — Analog Rytm Pattern Editor

A browser-based pattern editor for the Elektron Analog Rytm (FW 1.70+). Runs entirely client-side: open a .syx dump or pull the current workbuffer over Web MIDI, edit trigs and parameter locks in a familiar step-grid UI, and send the result back to the machine.

Includes a built-in audio preview with TR-909-flavour drum voices for quick rhythmic feedback while editing — useful for sketching patterns away from the hardware.

Features

• Trig grid: 12 tracks × up to 64 steps, two pages. Click to toggle, ⌥-click for lock trigs, ⇧-click to mute.
• Parameter locks: inspect and edit plocks for every per-step parameter (SYN/SMP/FLT/AMP/LFO, sends, trig conditions, retrig, micro-timing, swing, slide, sound locks).
• Advanced scale mode: per-track length and speed, master-length restart, and visible per-track playheads during playback.
• Audio preview: hand-rolled Web Audio voices dispatched by machine type (BD/SD/RS/CP/BT/LT/MT/HT/CH/OH/CY/CB plus SY/UT fallbacks), with sound-lock aware volume/pan and trig-condition evaluation. The editor's "Audio preview coverage" panel lists exactly what the preview reflects and what it ignores.
• MIDI I/O: connects to the first port whose name contains "rytm"; requests the current workbuffer pattern and kit via SysEx; sends edits back.
• File I/O: load/save .syx pattern dumps locally.

Usage

Open plock.html in a recent Chromium-based browser (Web MIDI + SysEx required; Firefox does not support SysEx). Either click Connect MIDI and Request Pattern, or Load .syx to open a dump from disk. Click a step to toggle, ⌘-click to open the step inspector, click a track label to edit its defaults.

Files

• plock.html — main editor page
• index.html — redirect stub for GitHub Pages hosting
• style.css — all styling
• ar-state.js — app state container and UI helpers
• ar-constants.js — byte offsets, enums, machine tables
• ar-sysex.js — SysEx decode/encode, pattern/kit parsing
• ar-editor.js — grid rendering, step/track inspectors, parameter editing
• ar-midi.js — Web MIDI connection and transfer
• ar-audio.js — tick-based scheduler, voice synthesis, playhead

Credits

Pattern, kit, sound, and SysEx byte layouts are derived from the libanalogrytm reverse-engineering effort by bsp, void, and alisomay, distributed under the MIT license. This editor wouldn't exist without their work decoding the firmware 1.70 binary format.

Built by Plenty of Names in the Club.

License

MIT.