It’s an emulator for playing the entire back catalogue of Lucasarts games. It’s very well documented and ready to use. As I said, if you had some kind of general midi set up or Roland MT32 back in the day, you’d be laughing. The music is awesome.
The program is called Dreamm.
DREAMM is a backronym for:
DOS
Retro-
Emulation
Arena for
Maniac
Mansion (and other LucasArts Games).
I only discovered it myself in the last month or so.
For example, I loved X-Wing CD edition back in the day for the real Star Wars soundtrack but I need to try it with MT32 midi emulation. I bet the iMuse system sounds fantastic.