Why is this generic BP filter seem to magnifying amplitudes when I run it at lower sample rates? The bass range seems to 32 times louder at 1275 Hz (44.1 kHz / 32) than at 44.1kHz?
Here is a graph of a birdsong which has been passed through 128 BandPass filters on MIDI notes 0 to 128.
To make the graph draw faster, I have attempted an experiment: skip 32 audio samples for frequencies lower than 150HZ.
The filter-bank draws 15 times faster, but the results are wrong: the frequencies lower than 150Hz seem to have been multiplied by an amplitude of 32? What is happening?