Go to Program Menus > Sound > Part Setting then Scroll through all the sounds until you see 'R.Bass'. Adjust the volume to your liking. You can also change the volume of the 'CHORD' voice here - one step before the R.BASS.
You should save this setting in Panel Memory since changing to a different set-up will change the R.BASS and CHORD settings.

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Willum
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Willum

After silence, that which comes nearest to expressing the inexpressible is Music.
Aldous Huxley
( especially when the music is played on a KN7000....)