I connected a small mixer to my DOS gaming machine. It's small but built well with a metal enclosure, and has four inputs—just right for my setup:
- Soundcard output
- MT-32 output
- SC-55 output
- CVX4 Covox clone
I did this because I've found that some games with MT-32 soundtracks mute the LINE IN on my soundcard when they start (most notably for me, Might & Magic III and Prince of Persia 2). I also figured it would better to run the MT-32 and SC-55 outputs separately rather than daisy chaining them. This means I can also just turn both units on whenever I turn my PC on, and then use the mixer to mute whatever is not being used by a particular game (as a side effect, this means I can use the screen on the SC-55 to monitor channel levels for the MT-32!).
With this, I am pretty content with this machine. It took a few months of scrounging for parts where I could, getting used to DOS again, and troubleshooting little issues here and there... but now I can run anything from speed-dependent games (Wing Commander) to early unaccelerated 3D games (Quake) on actual hardware with the "ideal" music device for each game, so I feel like I'm in gaming heaven 🤣.