Author here: I wish! I own a TG77, and it's an absolutely amazing synth. While I don't have any direct experience with the SY99, the 77 was so far ahead of its time. The sheer amount of features packed into the synth alone is an engineering feat.
Oh, and it's even more unbelievably massive and heavy. I will never part with it - they are the most criminally underrated synths, and it's crazy they are still often priced lower than the DX series.
It would be great if someone would built a better live editor for them though.