Put up a patch, from Pure Data.
It's good to create subtle to drastic changes on almost any kind of incoming music/audio and uses volume changes in this material to alter it's own function as well.
Essentially, what it does, is harmonically bandpass filtering incoming audio.
One can tune the harmonic filter to a base tone, then a bandpass filter with adjustable Q will oscillate through a variable range of harmonics of that base tone, in random fashion, but triggered from volume chnages in incoming audio.
Very good for remixing or just to add character to a mix.
Obviously works well with for droning (or otherwise modal) music in general, but can aswell get very funky on hip hop tracks or solo instruments.
here might be an update adjusting fx volume, some point soon.