Hi all, here finally the external object that is central for the cq2midi application posted earlier. It has already been sitting unpublished on my computer for too long. It can be a valuable tool for general spectral analysis. Contrary to the FFT the frequency scale can be freely adjusted. Binaries are currently provided only for MacOS (Pure Data and Max), but the source code is open (GPL licensed).

http://grrrr.org/research/software/constantq

gr~~~

-- Thomas Grill http://grrrr.org