James, thanks for stopping by. As Jeff Roberts referred to above, how would you suggest using it on a previously recorded track where you don't have access to the guitar?
Well, that is where it becomes interesting, in a qualified and nuanced way. We didn't design the product to be used that way. But what we and some of our beta testers have found is that, because undersaddle piezo pickups (USTs) tend to be more similar than dissimilar, you can get away with this trick under some conditions. More specifically, I mean that it is sometimes useful to post process a track recorded as a straight DI signal from a typical UST piezo with ToneDexter and you can achieve much better results than just trying to EQ it. You would have to chose a WaveMap that you'd previously created that was "in the ballpark" of the guitar you were trying to fix. It won't be as good as if you had access to that particular guitar and could train it first, then post process the track. But, it may be usable and better sounding than anything else you could do, nonetheless. One of our beta testers has done this very thing to fix the live-performance guitar tracks of some well known artists, in the context of an upcoming PBS special.