I guess it depends on type of sound you are using.
PSR9000 can have 8 tones per sounds. some drums are upto 4 waves per key.
so that will droup your polyphony to
16 notes... and if you layer two sounds using 8 waves for one key... your polyphony is "8 keys".....

I know this is the extreme situation, but this might be happening, when you are playing along accompainant...




[This message has been edited by Shakil (edited 10-05-2000).]