Found-player: scratch mode on chops (turntablist read-rate DSP)

Paul: 'introduce the concept of scratching on samples from time to time.' Adds an opt-in f.scratch to the chop renderer: the read position oscillates forward<->reverse (a triangle wave, constant rate each direction) over passes across a small of the buffer, so the chop plays fwd/back/fwd

▶ Play it: Barometric Stampede — parked on the genre this change names https://stellate.app/?genre=jungle&seed=5585&path=1718.20504,1737.20537,1699.20537&xdur=13.122

def90c6 https://github.com/aboard-io/stellate/commit/def90c618427e2a97229e6b64d39c9fd900fb365