def step.pay
import emerging-ezaudio@0.4.0.0/src/wav.bend as Wavimport Base
300def step.pay(st: St, +hd: U32) -> St:
301 match st:
302 case St{_ph, +left, tag, sz, seen, kind, ch, rate, acc, frames}:
303 step.pay.at(U32.is_eq(left, 1), left, tag, sz, seen, kind, ch, rate, hd <> acc, frames)