Default [Q] SuperNexus 4 i9100 (Faryaab) - How to remove safe volume popup

Hi there

I'm under 10 post so can't ask my question directly in the right thread : http://forum.xda-developers.com/show....php?t=2585984

The supernexus is exactly what I was looking for, a pure google stock rom, really enjoy my S2 again

But aftery days of use, there's only one setting I can't fix : everytime I plug my heaset and up the volume a bit, got the damn popub alert
Nothing on the rom seems to able to disable this popup, even though CM 11 actually includes this option and the Supernexus rom is based on it
I've spent hours on it and none of the potential above solutions found on xda have worked so far (apk tool, add & edit "default_gain.conf") :
1. http://forum.xda-developers.com/show....php?t=2226069
2. http://forum.xda-developers.com/show....php?t=1989533
3. http://forum.xda-developers.com/show....php?t=1722136

Many thanks in advance for your suggestions