Hi jimbell52,
yes, just switch off ACMP and switch on the LEFT part (for the Bass voice). If necessary, adjust the Left Split Point (press [Direct Access] > [Sync Start]).
Note: To save everything to a Registration, you have at least to tick the boxes STYLE (for the Left Voice and the Left Split Point) as well as VOICE and HARMONY/ARPEGGIO (!). The latter is also necessary if the Harmony/Arpeggio function is not used, namely to ensure that this function is switched OFF by the relevant Registration, if it was used before.
If you want to play with Style, but still want to play the Bass manually, you can switch on the "Manual Bass" function (in the Split Point display) and set the "Chord Detection Area" to "Upper". (See also the attached picture.)
Best regards,
Chris
[attachment deleted by admin]