Mainly for Syncrotron, and please forgive if advising the obvious.
MG2 relies on precision tuning of the axe to 440 standard.
Guitar can be perfect in tune with itself, but if outside the 440 reference even slightly, will track (more) erratic and higher probability of false notes.
Bit of a limitation on how things work, but if you use a tuner and get the axe to standard pitch, false notes will almost be absent (or at least minimized).
Tracking in ver 2 is way superior to what ver 1 did. Still waiting to see what they can deliver with bend and vibrato.
John