No real need to go through all that work for your purpose. Most styles have the same instruments in the same channel, so you can just turn off what you want, then go to

Functions>Style Setting>Style Change Behavior> Tempo>Hold and Part On/Off Hold.

These settings will always come up unless you do a hard reset.

This will hold your settings until you change them and they will continue to hold when changing styles in between songs.

If you have the Tempo and Part set to Reset, it will do just that when changing styles in between songs.

If you want to use the occasional style where the guitar and piano is switched, then you could edit that style and save it on your user memory and use it in your Music Finder.

It doesn't take much to fill up that user memory when combined with all the user files that can be saved there.

The thing with the occasional style where the guitar and piano is switched needs to be addressed by Yamaha. It is usually on the jazz combo styles only. I was going to list this on the T2 thread, but figured it would get lost with the way that thread went last time I checked

If you need help editing a style and saving it and putting it your Music Finder give me a call.

Best
Scott