John, interesting idea....I was trying to change the sounds at the measure break, BUT because the music has a ties from last measure to the new one that's when I get the bad surprises.

It only happens if you let the OTS link handle the OTS change, not if you do it yourself (would rather let the OTS link do it, but not going to happen unless I go in and do DSP setup programming to make the DSP match on the 2 sounds). It's workable...in fact I may not use the OTS link at all so things are consistent... I can use OTS or registrations instead.

The key here is: you have to have your R hand OFF the keys when you make a Var change using either OTS link or even if using OTS or REG. buttons by themselves.

I used to use registrations on my old Yamaha HS8T organ (was that cool the buttons were in between the upper/lower keyboards)