Show HN: Contrapunk – Real-time counterpoint harmony from guitar input
Contrapunk is an open-source Rust-based tool that converts guitar input to MIDI and generates real-time counterpoint harmony using classical music theory rules with sub-10ms latency.
CONTRAPUNK
Real-time MIDI harmony generator and guitar-to-MIDI converter. Proper counterpoint rules. Sub-10ms latency. Built in Rust.
Free. No login. Browser works in Chrome with any MIDI controller.
🎹 HARMONY ENGINE
8 harmony modes with real counterpoint rules. Palestrina, Bach, Jazz, Free. 28 scale modes. Deterministic voicing.
🎸 GUITAR INPUT
Plug in your guitar. Real-time pitch detection, onset tracking, auto-calibration. Play guitar, hear counterpoint.
⚡ SUB-10MS LATENCY
Single-cycle detection, 2-frame voting, 128-sample buffers. Fast enough for live performance.
🌐 RUNS EVERYWHERE
Native desktop via Tauri. Browser via WebAssembly. Server mode for studios. Same Rust core everywhere.
🎼 VOICE LEADING
Parallel fifths rejection. Voice crossing prevention. Spacing rules. Centuries of music theory, in code.
🔓 OPEN SOURCE
MIT licensed. Counterpoint rules are centuries of human knowledge. They should be accessible to every musician.
There was a 1970s Indonesian progressive rock band also called Contrapunk that released an album called "Putri Mohon Diri". They blended traditional Indonesian instruments, intense guitar work, and classical influences. Listen on YouTube.
Source: Hacker News
