Classic FM synthesis combined with ROM-based sounds make this vintage digital synthesizer a true classic (albeit challenging to master). TG77 patches should also work with SY77.
Raw bass sound. Glitchy filter wobbles and adds depth. Filter mapped to CC74. At higher cutoff frequency sounds like a small static broken speaker sound.
Plucked sound mixed with bleating goat noise. Filter mapped to CC74. With filter frequency at minimum, sounds like a nice dark moving EP, but weirder.