Advanced FM that came with the SY series keyboards and now 8 operator FM on the Montage present some pretty impressive FM sounds way beyond the DX-7. But I still haven't played a ROM based keyboard that has the velocity controlled expression of even the DX-7 let alone more advanced FM releases. I am not saying FM synthesis can replace ROMplers but the combination of both is ideal. That is why the Montage is a very attractive keyboard.