I am trying to convolute input signal with noise using pfft~. I use pfft~ to extract the input signals spectral data, and inside the pfft~ object, I perform again a fft~ and discard all but the real and imaginary parts of the bins with index less than 10 (this is so called cepstrum analysis). However adding this fft/ifft pair inside pfft~ object introduce a clicking noise when playing a voice for the very first time.

I’ve created a patch to demo the issue (max and max for live version). To reproduce the problem just play and hold keys sequentially (so that you’ll be using different voices). You should be hearing a short clicking noise at the very beginning of a voice when that voice is used for *the very first time*. It seems to be a Max bug but maybe I am doing something wrong? Any advices would be very appreciated!

click noise at the beginning of the signal when using fft~ inside pfft~ object