Forums > MaxMSP

tuning/pitching resonant filters, need help with [expr]

July 8, 2011 | 4:30 pm

Hi
I am separately tuning a resonant filter and an IIR delay line, to give a 2 octave scale. Using my ears I’ve got 520Hz for middle C, 1040Hz for the octave above and 2080Hz for the next C above that. For the delay line I’ve got 132, 264 and 530 for the same pitches.

Can anyone work out the expression I need to use on a single integer/float input to give me those values; ie 520=132, 1040=264, etc. It is almost doubling every octave, but I’m aware that we hear pitch frequencies on a logarithmic scale. I’m not too concerned with precision, just an approximation.

Thanks
Brendan


July 8, 2011 | 4:40 pm

It seems to be just a division of approx 3.94?


July 8, 2011 | 5:44 pm

Hey Tim

works perfectly; [reson~] and [tapout~] now permanently consonant, thanks

Brendan


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