Guys...thanks for your input - I'll take time later to consider them all in detail.
In the meantime, a bit more info.
I need to capture the frequency soon after the string is plucked but not too soon else too many complex harmonics are still embedded in the signal. I'd imagine coming in to make my 'sample' about 300ms after the pluck (I have a preset PIC threshold that when breached assumes a note has been plucked, which will allow me to pause 300ms before sampling).
I can't imagine going past 500ms after the note has been plucked (else the note will have decayed too much) so this only gives a maximum window of about 200ms to glean what the frequency is.
If it helps, I'm using a 16F690.
Acetronics - just seen your post - I'm using a sustainer which thankfully drops out all harmonics and leaves a relatively pure fundamental ( http://www.youtube.com/user/hankmcsp.../0/u6gm5fY1wM0 ie a nice sinewave!) Wrt to sustain - some frquencies are quite tricky to sustain, so I need to know when they're plucked to trigger special handling
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