Most of the two-keyboard setups I have seen the upper board is used for the styles, but I think this is a matter of preference, especially of the boards are identical. Now, if the boards are completely different, then both could be used for both styles and right hand voices.

At one time I had a two-tier setup consisting of a PSR-500 and a PSR-5700. After a while, I realized that this was insane and I began lightening the load - smartest move I ever made.

I had a friend who had essentially the same setup, and he used one board for bass, while the other board was set up as a bare bones rig. He lightened his load by switching to bass pedals that midi connected to his PSR-2000, and later, his PSR-3000. His right hand voices of choice were piano, vibes and tenor sax. He sometimes combined the piano and vibes voices with a strings layer - he was a fantastic musician. Unfortunately, he passed away this past year after more than 60 years on stage. He began playing professionally at age 16.

All the best,

Gary