make-butterhp frequency make-butterlp frequency make-butterbp frequency bandwidth make-butterbr frequency bandwidth butterhp b signal butterlp b signal butterbp b signal butterbr b signal
frequency is the cutoff or center frequency in hertz, and bandwidth is the bandwidth in hertz. Do not set bandwidth > (/ *srate* 2).
The values for frequency and bandwidth can be set within a run loop:
set-butterhp b frequency set-butterlp b frequency set-butterbp b frequency bandwidth set-butterbp-frequency b frequency set-butterbp-bandwidth b bandwidth set-butterbr b frequency bandwidth set-butterbr-frequency b frequency set-butterbr-bandwidth b bandwidth