This is an excellent rom I was going to try, but I know its good.
There is your problem, it is 6.1, so the registry is prob a little different.
For 6.1, try a "briggs audiopara3" cab I wil post.
The ipolesion cab has a slightly newer audiopara.csv file in it and it is renamed with specific reg entries for device to see it.
I also will post a tweaked version to TEST..LEMMY KNOW IF IT WORKS BETTER!
Don't download unless you are willing to test, as I just wokeup and haven't tested it, so please don't try unless your willing to break you volume haha.
If so just uninstall
I followed member "Puff601" post on page 4, and modded the reg with his suggestions.
I did not mess with any bluetooth or hand set reg, only main volume and call volumes. so don't worry about that, as when I looked it was all setup good anyway.
Here it is:
