Use a lowpass filter with -6dB/octave or so. You will NOT get rid of the
string plucking sound like this. You need to remove it in software. Delay
the freq. measurement start a fixed time (or periods) after the signal
starts.

Remember that saying about nothing meing so simple when you look at it
from close enough ? <g>. I'm having a great deal of fun with rotary
encoders (cheap ones) along these lines now.

good luck,

Peter

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