the filter has also a frequency offset pin which is a number and it’s in Hz. I used bandpass with transistor ladder so I could have narrow “samples” on each note I cared about (in my case 7 octaves, 84 notes so 84 filters + one low pass below and one high pass above to help filter out low- and high broad spectral voices leaking into the range I’m interested in like kickdrum, hihats or claps)
of course if you want gist involved you could just have 2 filters for your range, a high pass first to filter out the unwanted low frequencies and a low pass second to filter out unwanted high frequencies