As above - I originally had MSFW buttons added when I had a midline - the volume buttons worked, and the right hand buttons changed the MFD screens between MPG, DTE, hours driving, etc. When I had a hi-line fitted, I then had the full functionality - the right hand buttons now allow me to change track from the wheel.
Eddie did the cluster swap on mine - great chap, and can thoroughly recommend him if you need any coding / retrofits!