Hi Stefano, I don't know about your problem, but here you can find 64-bit versions of fiddle~ and sigmund~: http://vboehm.net/downloads/

Thank you very mutch, it's a great news.

2000Hz seems to be working fine for me here:

Were you testing differently?

2500Hz is a real limit, though. The fzero algorithm trades good low frequency performance for poor high frequency performance.

You might be able to get around that by upsampling it inside a poly~. Away from my computer at the moment so can’t test this, but if 2500 is represented within the algorithm as a fraction of the samplerate, increasing the samplerate should raise the cutoff point. You can test this by simply increasing your samplerate. If that works, wrap fzero~ in a poly~ Yourpatchname up 2.

Yes, I agree. In any case the new fiddle~ and sigmund~ are better. Thank

FWIW, the upper limit for fzero~ in Max 8 has been upped to about 8800 Hz.

Well, better, but not very good.

More specifically, the max frequency is set to the sample rate * 0.2. So, higher frequencies are possible at higher sample rates. Realistically, the algorithm probably needs at least 10 samples in a period to work properly. 8820 Hz at 44.1 kHz sample rate is 5 samples, which is really pushing it.

I think that's nearly the top of useable fundamentals for audible music. I can imagine wanting to identify other fundamental frequencies, but I think that these are a bit of an edge case? At that point, the hottest fft bin is always the correct answer because there are no salient harmonics.