i bent a pss 780 last weekend : (simmilar to pss680)
with the pcm drums/ rhythms some freaky things can be done,
loads of distortions /overdrives on the FM sounds
strange enough i didn't seem to get real access to the FM chip... it crashed everytime
at least i found a kind of random arpergiator wich mixes up the fm tones....
but a bit disapointing after all.
expected a bit more from this former yamaha flagship...
it is a nice keyboard anyway ; midi, synthparameters witch can be changed, rhythm pads
see if i can get rid of it
for me, the pss390 remains the best from this series