Hearing a synth think its way toward you

A five-parameter FM voice descends a spectral-loss gradient in real time — sliding its own knobs downhill, step by audible step, until its timbre becomes the target's. The optimization loop is the instrument.

The glowing valley is the live loss landscape over two of the synth's parameters (ratio × index). The bright point is the synth, rolling downhill toward the star — the target basin. The two curves at the base are the target and synth spectra, converging. A seeded synthetic singer drifts, so the minimum keeps moving and the synth keeps re-chasing.