The 250 is a ROMpler. Synths right before that were usually, mostly FM. Then there were analog synths ( Moog, Oberheim, the other suspects ). A ROMpler has sa

The 250 is a ROMpler. Synths right before that were usually, mostly FM. Then there were analog synths ( Moog, Oberheim, the other suspects ). A ROMpler has samples built in ( in ROM, although that doesn't mean masked/permanent ROM - probably FLASH ). I'd compare it to when PCs had soundcards with FM MIDI vs. Soundfonts. The quality in sound went up immensely.