PSR510 only has four song capacity with 1600 notes each. I have tried using PSR510 as a tone generator successfully on PC486, with Encore notation program and Pro4 sequencer. Auto accompanyment is fun. It has five fingering modes for people with differnent piano skill level. It allows you simple editing on the preset 100 styles or create your own customized version.
Most sound quality are good with a few exception.
The sampling of Oboe, Clarinet, Basson and English Horn are excellent. The flute is good and fair at high pitch. But I am used to the fat string from Krog X3 or Roland JV80 and not so impressed with PSR510. As I mentioned, I hate its trumpet and its brass ensemble. I also dislike its piano section.