Thank you for your help in this Ted.
I was able to switch from Marimba 2 to Rack Combo B.
There are 2 issues that I'm still having with this after digging around.
1. Playback is not happening. I assigned the correct VDL channel, Midi Mapped correctly and the notation is correct (no orange note heads). There is sound on note entry but not on playback.
2. I selected 2 measures and clicked *change instrument* under utilities. This applied the instrument change to the entire staff I was using. In score manager it changed the marimba part to percussion. After setting this up as much as I could, I'm attempting to change back to marimba and now it's as though I'm adding another marimba staff to score manager. The sound is there but it's not the correct VDL marimba sound (it sounds like a bad midi marimba). In score manager I have set the device, channel, bank, & sound correctly ( just copied what the other correct marimba staffs look like)
I feel like by doing one thing, I'm messing up so many other things.