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File:Yamaha PortaSound PS-3 (1980).jpg - Wikimedia Commons
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PortaSwing" (Yamaha PortaSound PS-2) - YouTube
Yamaha PS-3 Portasound Keyboard - YouTube
Yamaha PortaSound PS-3 | Sound Programming
Yamaha PortaSound PS-3 | Sound Programming
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What do you call the Yamaha Portasound PS-3 Headphone jack? : r/piano
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