It's referred to as "Harmonic Content" and it's in the Filter section.

Press MIXING CONSOLE, Tab over to FILTER.

It's available on all channels in the Accompaniment as well as the RH 1/2/3, and LH.

What Tyros model do you have, Jackieh?

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