I have created a split performance with a CP80 Chorus on the right hand, and a Finger Pick Bass on the left side.
If I press the Assign Switch 1 I get a nice tremolo sort of effect on the piano, however the bass part seems to jump an octave or two higher (and quieter).
Looking in the Edit page of the Bass part, I can see that the Assign 1 switch causes Element 4 to sound, in place of Element 1.
I cannot see how this is done exactly, as I would like to disable this result and just have Element 1 to sound.
I remember seeing this sort of function used where people have actually used the assign switch to get two completely different voices out of the one part...