I don't suppose you'd happen to have one of these handy?

I'm afraid not, but I did track down that the settings are 8-bit, mono, uncompressed, and 11.025 kHz.

There’s this old program which can convert .wavs to system 7 sounds.

Thanks! It works. Unfortunately, my song was too big, so I'll worry about putting that in later. As for weapon sounds...when I convert anything to System Sound (either with this or another program I have), there's always the mildest big of lag delay between when the weapon fires and when you hear the sound; this lag doesn't exist in the original version of the sound. How did the soundmakers manage to get the sounds in there without the lag? =/

In any case, I've submitted the first version of my plug to the EV Plug-Ins zone. Just need to wait for it to be approved. It's called "Flying High 1.0", so if you're interested, have a ball.