Yes, that’s exactly the reply I copied the xml file from, which allows to fix the echo issue. What I was suggesting is that you ask him which lines to edit for your loud call volume issue. In this post, I explain how to find which lines were edited for the echo issue, which yielded a file that lists the original and edited lines in order to compare them.
I suspect the loud call volume can be fixed by editing one of those lines in the xml file, but I don’t know which one. I will gladly try to help you with this in a few days when I have more time, but for now I have exams to revise.
Cheers 