G15 Audio Echo/Reverb

So I normally use headphones with my G15 I got about a week ago. Once I started to read about the speaker issues the G15 can have i thought I better have a look and check mine.

My first issue was nothing was coming out of the speakers by the sides of the keyboard. I fixed this with the info from another post about them not working if the boot sound is disabled in Armoury Create.

Now my issue is with the reverb effect something is applying to the audio. I have Dolby Access installed but there isnt any switch I can see for echo or reverb. I uninstalled it completely but the problem is still there. I have had a look at the Realtek Audio Console but there is nothing there.

Does anyone know where this effect is coming from?