P7200 Adjust Audio Treble Level

I read thread: "Taming the Tinny Sound of a Jag 700P", and it referred to Audio Level Equalization, however that option doesn't work on the P7200. I found in the Rev.f of the P7200 User Manual, Section 8.21 Adjust Audio Treble Level. It refers to a 'Treble Menu' which I can't find in RPM. It's called out a couple of times in the User Manual. My P7200 has that "tinny" sound and that treble level menu sounds like the fix, without a hardware mod. Can you RPM experts help me out, thanks in advance.