Well the acid test is when I play a guitar into it & the pic 'triggers' a sound in midi synth module.
A bass E string 'period' is about 12ms (82.4Hz) ....add in the overhead that detecting the frequency will entail, then it's going to be higher.
They reckon the average musician can detect about 10ms of latency (ie from hitting a key, banging a drum,plucking a string .... to actually hearing the sound) so I'm already behind the curve so to speak. The commercial 'guitar to midi' converters pull this frequency 'detection time' in by detecting half a period....so for 82.4Hz, that'd be about 6ms - safely under the 10ms level - but I reckon that'd need a 40Mz oscillator to have the necessary granularity.
So perhaps it's better to go top down (the bass frequencies are at the top of the list), just to rescue back a little bit of 'processing time' for those lower frequencies (for example a 1Khz 'period' is 1ms, so I've far more time to play with vs lower frequencies.)
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