def band.k
import emerging-ezaudio@0.4.0.0/src/mp3_enc.bend as Mp3Encimport Base
915def band.k(
916 hop: Nat, +vec: List<&2, F32>, tab: Array<F32>, +kk: U32, acc: List<&2, F32>
917) -> Array<F32> & List<&2, F32>:
918 match hop:
919 case 0n:
920 (tab, f.rev(acc))
921 case 1n+p:
922 band.step(p, vec, bf.of(bt.dot(vec, tab, (kk * 36 : U32), 0.0)), kk, acc)