mikael-lovqvists-claude-agent
d58d0d3b09
Synthesizes kick, snare, hi-hat, bass, and acid lead from scratch. 32-bar song structure with filter sweeps and pattern variation. Outputs raw float32 stereo at 44.1 kHz to stdout. Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
70 lines
2.4 KiB
Markdown
70 lines
2.4 KiB
Markdown
# techno-gen
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Generates infinite procedural techno music as raw float32 stereo audio on stdout.
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138 BPM. No samples — everything is synthesized from scratch.
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## Build
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```sh
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make
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```
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Or manually:
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```sh
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gcc -O2 -Wall -lm -o techno-gen techno-gen.c
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```
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## Play
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Pipe directly into `paplay` (PulseAudio):
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```sh
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./techno-gen | paplay --format=float32le --rate=44100 --channels=2
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```
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> **Note:** `paplay` is part of the `pulseaudio-utils` package.
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> On Debian/Ubuntu: `sudo apt install pulseaudio-utils`
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### Mono version (if you only want 1 channel)
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The program outputs stereo (2 channels). If you want mono, mix down with sox:
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```sh
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./techno-gen | sox -t raw -r 44100 -e float -b 32 -c 2 - -t raw -r 44100 -e float -b 32 -c 1 - | paplay --format=float32le --rate=44100 --channels=1
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```
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### Record to file
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```sh
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./techno-gen | sox -t raw -r 44100 -e float -b 32 -c 2 - output.wav trim 0 120
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```
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This records 2 minutes (`trim 0 120`) to `output.wav`.
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## What it sounds like
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| Time | Section |
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|---------------|----------------------------------------------------|
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| 0–3 bars | **Intro** — kick + bass, filter closed |
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| 4–7 bars | **Rise** — hi-hats join, filter opens |
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| 8–15 bars | **Full** — snare, acid lead, LFO filter sweeps |
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| 16–19 bars | **Breakdown** — bass only, stripped down |
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| 20–23 bars | **Build** — kick returns, filter climbs |
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| 24–31 bars | **Heavy** — syncopated kick, acid variation 2 |
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| *then loops* | Back to bar 8 (never the sparse intro again) |
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The cycle is 32 bars (~1 min 23 sec at 138 BPM), then repeats with continuous filter and pattern variation.
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## Synthesis
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All audio is synthesized in real time:
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- **Kick** — sine oscillator with pitch envelope (200 → 45 Hz), amp decay, transient click
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- **Snare** — high-pass filtered noise blended with a 185 Hz tone
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- **Hi-hat** — noise through a 7 kHz high-pass; open/closed variants with different decay times
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- **Bass** — sawtooth oscillator through a resonant (Q=4.5) biquad low-pass with per-note filter envelope and glide
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- **Acid lead** — dual slightly-detuned sawtooth through a very resonant (Q=6) low-pass; filter sweeps with LFO per section
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- **Stereo width** — short delay line (~11 ms) ping-ponged between channels on hats and acid
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- **Master** — `tanh` soft saturation to keep levels honest
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