predcon: I already have MUNT installed, along with the Control Panel applet mentioned on
Munt's Sierra Help page. I just don't know how to configure it, neither generally, nor specifically for WC. WC uses the Roland for both sound
and music, so I don't know if that presents a problem.
SpooferJahk: I never used that control panel applet but it seems similar to BASSMIDI so open that up and make sure the MT-32 driver is set for MIDI playback. MUNT doesn't need much configuration outside of telling it where the MT-32 ROM files are and I am assuming you already did that since you say it is all set-up and ready to go.
Configuring Wing Commander 1 + 2, at least the GOG versions, to use the Roland MT-32 will require you to edit the cfg files of the games since they do not have their respective sound setup utilities. Starting with the first game, the files you need to open are WINGCMDR.cfg and CRUSADE.cfg and they will have a line like this in the file:
v a904 z
Replace the a904 with an r so it looks like this:
v r z
The same can be done with Wing Commander 2 and the file you are looking for in that directory is wc2.cfg, just replace the a904 with an r and you will have that game working with Roland MT-32 support as well.
Thank you thank you THANK YOU! I have been reading GOG threads all day trying to figure out how I could get MUNT working with GOG's WC release, and this is the first solution that WORKED!