[sdiy] PLL examples

[JH.]

> Guitars are notorious for trashy output signals.  What really confuses a
PLL
> is the fact that a guitar signal can have more then 2 zero crossings per
wave
> cycle.

Zero crossings are more an indicator for formants than for the pitch of a
signal.
(At least I read that somewhere.)

As far as I can tell from a brief glance, that Boss circuit which was posted
yesterday
is looking for *peaks*, not zeroes. Looks very similar to the EMS method as
used
in the HiFli.

JH.