The SY77/99 and the FS1r are both synths that followed their own path since the DX7. Both can do DX7 sounds, but since they both followed their own path, eventually they ended up being slightly different from eachother.
- The FS1r has 1 algo-fixed feeback, the SY77/99 has 3 configurable feedbacks
- The SY77/99 has 16 operator waveforms -iirc-, the FS1r has 8, and they're different from the ones in the SY
- In the SY77/99 you can set the phase of an operator, in the FS1r you can't
- The SY77/99 has keyboard pitch scaling per key iirc, or at least something that scales, which is enough for pianos where the bottom end and top end are detuned', the FS1r didn't have this iirc.
- The SY77/99 has segment-style scaling, the FS1r has more classic DX scaling
There may be more details like these. Sure: as long as you keep things simple and stick to a sine and one feedback, sounds could be rebuild, but go any deeper than that and you'll see clearly where they differ.
As for ye olde discussion which is better, SY77/99 or FS1r, the answer is easy: no one can tell, it's apples & oranges.
"You know I love you, CS, but this is bullshit." (Automatic Gainsay)
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