FMOD Tip - Gitignore for the FMOD Integration in Unity (FMOD Unity Gitignore)

[jeff_fmod]

Just linking in the response from your other post here:

FMODStudiol.dll file stays in the project when switching branches

That DLL will be the DLL that Unity is using to run FMOD in the background. It cannot release it whilst the Unity project is open, which is by design, so you will need to close Unity before changing branches.