A little annoyance I have found on the PSR2000: Say you want to start a song without using the style's intro... so you select the style, and hit one of the variation buttons. It starts blinking and will give you a one measure riff intro whether you want an intro or not.

If you pre-select the variation button before hitting a style, the variation button does not blink and the style will start without the riff.

(Just another tid-bit for Scotty's book)