AHDSR transition not working only on WebGL platform

Hi, I am using a very basic AHDSR + looping for BGM but it doesn’t work on the WebGL platform. It works perfectly fine for PC/Android builds. The music just loop without decreasing in volume.

It seems to work on our machines. We are using FMOD Studio 2.00.04 and Firefox/Chrome.

Could you please post your code and explain where the AHDSR modulator is in your event?