The Manual Bass should de-activate the Arranger Bass line and allow you to manually (via Midi Chanel 3) control/play the bass.
To do this with the chords isn't as direct as it was on the MS units.
* Go to MENU - MIDI and set the CHANNEL RX for Chords 1-5 to "2".
* EXIT back to the main screen.
* Now select the style you want to play.
* Got to STYLE VIEW and press MUTE (F4).
* Now press F6-F10 (these are the Chords 1-5) to mute them.
* Next, play. You should now hear the chords MANUALLY as you play.

Hope this helps.

Thanks,

AJ