Pioneer FH-P8000BT + Sony RM-X4S Remote

[IsLNdbOi]

I know a number of you have the P8000BT double din HU. Have any of you tried using Sony's RM-X4S wired, rotary stalk remote? I've read on a number of websites that this remote works with some of Pioneer's HUs.

It's a really convenient accessory, especially for cars that don't have steering wheel audio controls (I installed one on my previous LB's steering wheel column).

[IsLNdbOi]

Got my Pioneer FH-P8000BT today. Hooked it up and plugged the Sony RM-X4S into it. Yes! It does work! All functions of the remote EXCEPT for the button which is used to access the audio options menu (bass, treble, etc.) in Sony head units, work. That button does nothing on the P8000BT. All of the other buttons on the RM-X4S functions with the P8000BT identically as they do with the Sony CDX-GT920U (which is the only Sony head unit I've owned).