I can confirm tmp.0.wav is there at the specific location. I don't have dspadcm.exe in the exelib folder. I imagine that's where it's getting hung up seeing as it's trying to refer to that program and the temporary file along with it. (.dsp)
For executables, I have ffmpeg, revb, soundstretch, and vgmstream in the exelib folder.
EDIT: I think I see the problem. The encoding is using Gamecube "DSP" 4-bit ADPCM.
EDIT 2: Okay, I found the file in the master pack on github, but when I try to download it, my computer deletes it for some reason. Same thing when I try to download the updated revb.exe file. I'm using Windows 10.
EDIT 3 (Last one I hope): Figured out it was my antivirus software auto-deleting those downloads, so I disabled the download intelligence function, and it was successful. Conversion went smoothly, so now I will test on the game. Thank you so much for you help thus far, BDS.