Yamaha PSS Keyboards Easter Eggs

Secret Mode on Early Yamaha PSS Keyboards! - 7.2/10 with 95 votes
On early Yamaha PSS keyboards, there is a secret mode that gives sound effects to the voice selection buttons. I know for sure it works on the PSS-80 'cos I had one about 10 years ago, and discovered it myself!

This egg will put sound effects and other... more
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