I was messing around with the VRC7 chip some more. The second lead is a bit harsh, so I'm going to fix that later. Finished: https://scratch.mit.edu/projects/471331482/
I found a program for mac called FamiStudio, and I really like it. It's also compatible with Windows and Linux. It would be very helpful if anyone knew how to convert WAV files to DPCM files on macOS.