As a TG77 user, I cannot even begin to say how exciting this is, potentially.
As it stands, our options are:
* Sound Diver (Obsolete, unsupported, unstable, not available for purchase anymore)
* Sound Quest (Commercial, mixed reviews)
* FM Alive SYM3 (Commercial, small developer, iffy looking interface, but geared for these synth models)
The TG77 and SY77 are amazing, deep, powerhouse synthesizers. But, of course, being Yamaha and being FM (among other things), they get pretty wacky complex to program!