The TG77 is a hybrid synthesizer that combines 6-operator FM and AWM2 synthesis for some very expansive sound creation capabilities. Yamaha refers to the FM synthesis as AFM, meaning Advanced Frequency Modulation. The "advanced" part comes from the availability of extra oscillator waveforms - 16 in all, with 45 different algorithms available. Each of the two engines is 16-note polyphonic, allowing for up to 32 notes of polyphony depending on how sounds are structured. It has PCM waveform and data card slots. item is in Good condition (6 out of 10) and fully functional. There are a few marks​/​scratches on the body of the unit and the rackmount ears are lightly worn. No accessories included. Covered by our 90 Day Pre-Owned Warranty.