so the PAC module that enable the sterring wheel to control the Z1,so is it just like control the volume, and song tracks? is there any more features? and for the Z1's Ipod adapter, i heard its quite slow, can someone give a more detail description on that?? i was thinking if i can hv both the Z1 Ipod adapter and the USA-Spec the same time( i m not saying to use them at the same time but to hv them in car installed)...? and if i already hv the OEM NAV,can i hv the Z1 at the sametime without interfere the reception of the navigation?? SomeOne please help me clear it out

 

The PAC interface will allow you to control volume, track, and I programmed my power button to act as a mute button. Why would you want the USA spec and the Z1 controller...they do the same thing. The Z1 controller is the same speed as the USA Spec IMO, plus it shows the song tracks right on the Z1 display.