Why did Zoom change their logo... the old one is so much better :-) I guess "SG" part stand for "sound generator" and it adds no effects at all (like reverb). I found the TMS57002 datasheet and it has less inputs than ES5510 so this soundsetup (Zoom and toshiba combo)is less flexible than the one for Taito F3... Taito must have changed because Ensoniq was bought by Creative.