Hi,
It is a requirement that you must have a window instance/handle to supply to an AudioContext to have something for FMOD to send audio to.
ie some basic webaudio code.
var AudioContext = window.AudioContext || window.webkitAudioContext;
var audioCtx = new AudioContext();
This might be your issue? You can supply a user supplied window handle to FMOD’s construction stage. The are not typically available in a worker or standalone side module.
In current FMOD API 2.4 testing we have a working node version for example, but it has to be FMOD_OUTPUTTYPE_NOSOUND due to the lack of a browser window.