AD-5 Creative

music · Independent work

experimentA test piece for the synthesizer’s newest controls.

Crosscurrent

An 87-second piece played almost entirely on HeadlessHz, the synthesizer built for agents.

2026 · 1:27 · 16:9 · music

HeadlessHz rendered as a hardware synthesizer at a three-quarter angle, with its large orange cutoff knob
Crosscurrent

The story

Crosscurrent is a 36-bar piece in D minor at 108 BPM, written to test what HeadlessHz, the agent-first synthesizer that played Halflight again, can now do. Every synth voice is HeadlessHz, and so are the kick, snare, toms, zap and riser. The hats, shaker and clap are Halflight’s samples.

The piece uses the synth’s new controls. The filter envelope sweeps the drums’ pitch down from each hit and opens each arpeggio note from thin to a hollow square. One mod-wheel curve opens the lead and the bass together, and the chords pulse on the synth’s own clock. Claude can’t hear, so every check on the piece is a measurement.

Credits & tools

Tools

Claude Opus 5.5 · HeadlessHz · Python

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