YAMAHA PSS-680 MIDI SYNTH with light-theremin mods | Flickr
Vintage Yamaha PSR-15 Electric Portable Keyboard. | eBay
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Yamaha PSS-120 PortaSound 32-Key Synthesizer Keyboard | eBay
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NIB Yamaha PortaSound PSS-140 Electronic Keyboard | eBay
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File:Yamaha PSS-15 Service Manual.pdf - Circuit Bending Wiki
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Yamaha Remie PSS-E30 37-Key Portable Mini Keyboard, White + Blueberry Bag | eBay
Vintage Yamaha Keyboard Portasound PSS 50 Tested and Working Made in Japan | eBay
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Yamaha PSS-15 | Synthpedia
Yamaha PSS list
Yamaha PSS-F30, 37-Keys Portable Mini Keyboard | eBay
Yamaha PSS-150 PortaSound Keyboard - YouTube
Yamaha PSS list
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File:Yamaha PSS-15 Service Manual.pdf - Circuit Bending Wiki
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CJP-Geek AC Adapter for Yamaha PSS-15 PSS-30 PSS-31 PSS-51 YPR-50 keyboard Power Supply - Walmart.com
