def blk.pre
import emerging-ezaudio@0.4.0.0/src/mp3_syn.bend as Mp3Synimport Base
1087# preamble: bands 16 and 0 at the current and next time
1088def blk.pre(
1089 lin: Array<F32>, gr: Array<F32>, +nch: U32, +zlin: U32, +tm: U32
1090) -> Lg:
1091 blk.pre2(blk.w4(lin, gr, nch, u.add(zlin, 60), 16, tm), nch, zlin, tm)