It allows you produce and record fat chord without losing notes. And there are from 0 to 15 levels for each type. A Pan button allows you to position each voice in different direction for truly stereo sound. I wish it allow me to edit other parameters. For example, the trumpet voice sounds too thin at high pitch.
Same problem happens for flute at that octave.
The song recorder is fun and easy to use. Track by track, you can record your performance or enter note by note. 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.