so I tried a bit with [bp~] but the problem was, that the amplitudes I got were pretty high (after comparision with incoming signal) - dont't know why. So I still don't know how to handle the incoming audio to get to know if a specified frequency range is contained by the the audio in. That's why I

tried >fft once more, but I have no idea how to calculate the data [rfft~] is giving >to me. Does anybody of you have an idea?

thanks, mfg Christian

have you tried

[hip~ 10000] | [lop~ 11000] | [env~] | [> x] | [sel 1]

where x is your desired threshold? you might add more hip~ and lop~ to get a sharper cutoff. this still seems like the simplest solution.

good luck