Yamaha SY77 6 Operator AFM Digital Synthesiser Sequencer WorkstationYamaha SY77 6 Operator AFM Digital Synthesiser Sequencer Workstation The SY77 is like having a super sized sample memory workstation with the added synthesis and sounds of a DX7. For its synthesizer section it employs a 6 operator AFM synth engine similar to, if not better than, the original DX's. The AFM section offers 45 algorithms, 3 feedback loops and 16 waveforms for creating some of those unique FM sounds. Sampled sounds (AWM2) which are in