Hello Connor!
Thank you very much for your answer you really helped me a lot I actually fixed almost all the problems with the information you provided.
The only thing remaining with problems is the volume attenuation when I have the sound behind me, I have the screenshot here.
I didnt know about the Sandbox and…wow its really useful! But sadly its so different when I put the sound ingame. Foro example for a explosion, I need a min/Max of 3/15 on Fmod Sandbox but ingame I need like 30/200. I dont know if may Im doing something wrong with the coords.
Thanks for your help!