Are you talking about the Vocal 300 harmonizer, or the pitch shifter in
the RP300A? The pitch shifter in my RP200 tracks well and is in tune.
(The whammy effect, a different kind of pitch shifter, isn't in tune,
but that's a different story.)
You can hear samples of a couple of octave-shifted RP200 sounds at my
website at:
http://www.hunterharp.com/DigitechRP/
You'll see a bunch of folders there -- one of them is for sounds
pitch-shifted down an octave. I think the stuff sounds in tune. See
what you think.
Regards, Richard Hunter
hunterharp.com