A bus's discrete-channel FORMAT (#176, 2026-09-08-lcr-mains.md) — 'stereo' or 'lcr'.
main and group only (the archive's phase-1 scope); lcr is refused on a group in a code
because the native seam has no group/matrix widen yet (recorded, native lane 2026-09-08).
A bus's discrete-channel FORMAT (#176,
2026-09-08-lcr-mains.md) —'stereo'or'lcr'.mainandgrouponly (the archive's phase-1 scope);lcris refused on agroupin a code because the native seam has no group/matrix widen yet (recorded, native lane 2026-09-08).