Is FMOD not suitable for playing background music?

Hi,

Thank you for sharing the information.

This does sound like an issue related to voice stealing and channel count limits.

I found a similar discussion that might be helpful : Lower Priority Events Are Voice Stealing Highest Priority Events - #2 by cameron-fmod

Additionally, could you please enable API Error logging and set the Logging Level to “Log” (Unity Integration | 8. Settings | 8.2 Initialization | 8.2.1 Logging Level)?

This will provide more detailed logs in the console. If possible, please share the full log output so we can investigate further.