interpolate
From TidalCycles userbase
Type: interpolate :: Time -> [ControlPattern] -> ControlPattern
Morph control values between patterns in four cycles. The argument supplied to `interpolate` is the ID of the new pattern that is created.
d1 $ sound "arpy*16" # cutoff 100
interpolate 1 $ sound "arpy*16" # cutoff 16000
Stop the newly created pattern using its id:
d1 silence