I'm sure you actually know that this is not true: The SY99 can indeed load user-specified PCM samples for AWM from floppy disk or SYSEX.himalaya wrote:The SY can't use custom waveforms (not counting Yamaha Sample Data Cards)
This is, in my opinion, perhaps the best feature that makes it infinitely customisable and the possibilities endless. Of course, it has plenty other advantages over the 77s: much better effects and master keyboard functions, supposedly better converters, 10 songs in the sequencer instead of 1, etc.