Retro Yamaha pss-470 portasound keyboard with 2 fm synthesizer  + great condition.box and power adaptor included Polyphony - 8 voices + 1 Drum kit (5 drum sounds) Oscillators - 2 FM Operators Filter - Spectrum and Modulation sliders Envelope - Attack and Decay sliders Effects - Sustain, Vibrato, and Duet Sequencer - Auto-Bass-Chord: Automatic bassline and chord accompaniment feature. Chords are selected using the lower octaves of the keyboard. Custom Drummer: Add any of the 5 drum sounds to the selected rhythm pattern in real-time. Patterns - 12 Rhythm patterns for the Drum kit and Auto Bass Chord: Pops, Disco, 16 Beat, Rock n Roll, Country, Latin, Bossa Nova, Reggae, Big Band, Slow Rock, March/Polka, Waltz Arpeggiator - None Keyboard - 49 mini-keys Memory - 21 Preset synth sounds. 12 Drum kit rhythm patterns. Control - None Date Produced - 1987 Comes with  Instruction Books: Let's play keyboard Electronic Keyboard Music Instruction Book A Electronic Keyboard Music Instruction Book B SFX-4  Latin Themes SFX-10 Classical Themes Electronic Keyboard Music Latin Songs Barbara Streisand Memories Listen, Look and play Cassette