By tracking, I assume you are talking about midi files. If you are referring to tracking using the harmonizer, well, there was a problem with the earlier PSR models, but not on any tyros since the T4.

As for the vocal quality, there wasn't a hill of beans difference when they were properly tuned, at least that was my experience. I Know you had an S970 and a PA4X, but from what you had posted in the past, I didn't think you ever sang through them and used your outboard vocal processors exclusively.

Gary cool
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PSR-S950, TC Helicon Harmony-M, Digitech VR, Samson Q7, Sennheiser E855, Custom Console, and lots of other silly stuff!

K+E=W (Knowledge Plus Experience = Wisdom.)