Welcome to the forum, you picked a good question for the first one.

To start you need to put your MOXF into GM mode because Biab sends GM patch information. You can change that later for now do that. The first question in this forum link explains how to find that in your Owners Manual:

https://www.yamahasynth.com/forum/accessing-user-banks/oldest

If you get GM working then try manually setting individual patches for all the Biab instruments. That is time consuming but you have access to better quality sounds than the GM bank which is usually fairly basic.

What would be really good is if one of the Biab users has posted a MOXF patch map for Biab. If it's there look up Patch Map in the Biab help file and see if the MOXF is there. It's possible a different Yamaha synth might work too.

I don't know how much you understand about midi, GM, patch maps and all that. If you know nothing about that then what I just wrote won't mean much. It's tricky for a noob. If you understand this then it may be easy. Just put your Yamaha into GM mode and hit play in Biab. If that works then look into a full patch map.

Bob

Biab/RB latest build, Win 11 Pro, Ryzen 5 5600 G, 512 Gig SSD, 16 Gigs Ram, Steinberg UR22 MkII, Roland Sonic Cell, Kurzweil PC3, Hammond SK1, Korg PA3XPro, Garritan JABB, Hypercanvas, Sampletank 3, more.