rgtaa,
According to Scott's early post PSR9000/9000 Pro has either 192 ppq or 480 ppq. If the ppq is around or above 384, I would not worry about it at all. I would not worry about 192 ppq either unless I am going to record/play at really low tempo values like 30 or 40 quarter notes per minute. (Still I can get around that by doubling the tempo value to 60 or 80 and cutting the playing rate by half to compensate). As UD and Don said, if it sounds right to me, I would forget all the numbers and go ahead with the recording.
Regards,
Shiral