DuB-EnG: Yamaha Portasound PSS-50 Synthesizer Keyboard Teardown Repair and Review - YouTube
Yamaha PSS “PortaSound” Models 1980-1997 – Piano & Synth Magazine
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Yamaha PSS-A50 (Review/Demo) PIANO, ORGAN, GUITAR, LOOPING, LAYOUT - YouTube
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Yamaha PSS-50 Demo - YouTube
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