bryan,

Thanks for the input.  A few things you can do (if you haven't already tried): You can set delay A or B to like to 10 or 20 ms and/or set the source mode to BASS to get improved polyphonic tracking. 

Also, a small thought on the POG.  If you notice, it only does octaves and 5ths.  These are perfect integer ratios of a fundamental.  I would guess there is really no "tracking" actually involved in doing this.  A perfect 5th is always a perfect 5th, and and octave is always an octave.  There are signal processing constructs that allow efficient harmonic generation of perfect intervals.  However, doing 2nds, 3rds, 6ths, 7ths is a different ball game b/c the shifting depends on scale and the input signal.