== per-round cascade cue timing ==
-- started-count across a 5-round chain --
e=0.00 -> 0
e=0.10 -> 0
e=0.20 -> 1
e=0.50 -> 1
e=0.55 -> 2
e=0.90 -> 3
e=1.30 -> 4
e=1.70 -> 5
e=5.00 -> 5
-- ascending per-round run --
round 1 -> [sx] audio: cue combo1
round 2 -> [sx] audio: cue combo2
round 3 -> [sx] audio: cue combo3
round 4 -> [sx] audio: cue combo4
round 5 -> [sx] audio: cue combo5
-- non-cascade --
1-round@end 1
0-round@end 0
-- deep-chain cue clamp --
round 1 -> [sx] audio: cue combo1
round 2 -> [sx] audio: cue combo2
round 3 -> [sx] audio: cue combo3
round 4 -> [sx] audio: cue combo4
round 5 -> [sx] audio: cue combo5
round 6 -> [sx] audio: cue combo5
round 7 -> [sx] audio: cue combo5
ok: one ascending combo cue per cascade round, clamped at combo5