Wow this is all that it took to fix it. Wonderful. Thank you so much Suavo!
I would definitely add a warning about using MP3s as your audio input. (You write the guide right?) Because wow, this was a pain in the ass. I'm glad that we got it figured out, though. That way I'll know for next time.
I really appreciate all of your patience and help with this! I didn't even imagine it could have been my audio that was causing it, so I never ever would have figured this out. You guys are life savers!