fastGap :: Pattern Time -> Pattern a -> Pattern a
fastGap speeds up a pattern like fast, but rather than it playing multiple times as
fast would it instead leaves a gap in the remaining space of the cycle. For example, the following will play the sound pattern "bd sn" only once but compressed into the first half of the cycle, i.e. twice as fast.
d1 $ sound (fastGap 2 "bd sn")
See also: fast.