Yamaha has the enhancer in both top range PSR and in the Tyros line.

They first started using an enhancer way back in the PSR-8000.

I still have an old Aphex Aural Exciter type C from years ago...used to run the Jupiter 8 through it.

Ian
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Yamaha Tyros4, Yamaha MS-60S Powered Monitors(2), Yamaha CS-01, Yamaha TQ-5, Yamaha PSR-S775.