Hi all,

I'm writing a Max external called sparkle~ and I have a problem.

It's a tool for frequency processing: in the first version I was doing windowing and overlapping my self, taking and giving audio data, such as:

adc~ 1 ! ! sparkle~ (overlapp add, windowing, fft, ifft, cartopol, poltocar, ... all inside) ! ! dac~ 1

Then, for some reasons, i decided to make it work inside a pfft~ subpatch like this:

fftin~ 1 ! ! cartopol~ ! ! sparkle~ (not windowing nor overlapping anymore, just data processing) ! ! poltocar~ ! ! fftout~ 1

Here it is my problem:

the resynthesis is not good as I get when I was doing the overlap myself (is like filtered). I suppose I'm loosing data because in the perfom function of the external I only have access to vector-sized buffers not to FFT-sized buffer (as I'm supposing should happen inside pfft~). But if I try to access more data everything crashes, as if it were not allocated.

Can anyone give me a hint to solve the problem?

Thanks a lot, Carmine