Released in 1986 - The Yamaha DX27S is a 61 key (8 voice) FM synthesizer, featuring 4 operators (8 algorithms) with dedicated (ADSDR) envelopes, a pitch envelope, an LFO (saw:up square triangle random waveforms), 216 presets (24 editable), tape interface, breath-control input, chorus, stereo speakers, and MIDI.