Everything works in Unity, but when I build, only the events called as a one shot are heard. The events that use .start() are not heard in the build. Any thoughts?
Can you confirm there are no errors being returned from any FMOD APIs surrounding the Event you are trying to start? Is this problem specific to HTML5 or do you have this issue if building standalone for Windows / Mac?
Are there any errors or warnings being printed to the log?
Have you tried connecting the Studio profiler to see if the Events are actually playing but perhaps inaudible for some reason?