Jerry, you've seen my setup, and like Johnathan I'm primarily a singer/player, I rarely use midi files, and only use MP3s for breaks, if and when I take them.

What is on my cart is what I use for 99 percent of my jobs, but there are times when there is an additional Bose L1 Compact on the bottom. Even with that load I still have some room to spare. The R-10 extends to 52 inches, which is usually more than enough for most arranger keyboards of 76-keys or less. Of course, if you have an unusually long case, then all bets are off.

Cheers,

Gary