I've got an entry level Yahama PSR Keyboard that has an "auto accompaniment" feature. I use it on some live performances. I'm wanting to get a better keyboard with an option for accompaniment (bass drums ect.) that is modifiable/programmable. The PSR has very limited options and the accompanimnet styles are not user programmable. I'm looking at the Yahama MM6 and the Korg MicroStation. Do either of these keyboards have a function similar to the auto accompaniment on the entry level Yamaha's that's more geared to live performances and user definable? Are there other/ better options for music backing in the $500-$800 price range?