I don't know. I used to own a Yamaha SY22, I now have a TG55. Neither of these allow you to edit the operators the way you can on a proper 'full' FM synth (i.e. how the operators affect each other) and are a sort of hybrid PCM sample based / FM synth crossover.

I'm guessing the TG77 is the same.

I wish I'd bought a TX81Z instead :cry: or an old DX21/27 or DX100 (mini-keys are in!)

FM7 - :?: your obviously a 'soft'[ware] boy. ;)