Okay...so I plugged in GM.DRV for my sound, and how I had laid it out on Anvil Studio 2012...well, it wasn't how it sounded at all. The flute sounds became piano, and the nice church organ that I had came out extremely different. So I toyed around, thinking that it must have been some sort of weird bug.
...and then I plugged in MTBLAST.DRV as my sound. And it sounded exactly how I had intended it to on Anvil Studio. Assuming that I'm not crazy, I'm thinking that MTBLAST.DRV is the way for me to go with the rest of my project.