A minimal language for additive synthesis: sum sine oscillators shaped by multi-point envelopes, and watch the spectral entropy of the result — the Shannon entropy of the normalized power spectrum, a rough measure of how spread out vs. concentrated the sound's frequency content is. Everything runs at audio rate — no separate control rate.

sin(freq, amp, phase[, pan]) * env(v0, t1,v1, t2,v2, ...) — phase in radians, pan from -1 (left) to 1 (right, defaults to center), env is a Csound-style linseg (start value, then time/value pairs, any number of points). let name = expr / [array], arr[i] indexes (0-based). for x in a..b { ... } or for x in array { ... }.