The CD changer (and MOST) protocol is what the Gateway uses, so that the car can recognize it. This protocol is a little limited, therefore most of all you have the Next/Previous track buttons and CD1-CD6 (buttons 1-6) for controlling the music playback – but the control wheel of the car works in most cases too.
- CD1: If you select this one, you can see the Now playing menu where the current played song info can be seen. If you select a music file or don’t do anything in the menu for more seconds, the Gateway will switch to CD1 automatically.
- CD2-CD5: not used
- CD6: Disc 6 is the Menu of the Gateway. Under this option, you can find the Source menu where you can select between the different connected sources. Also you can browse the content of the active source. The content of the browsing menu is source dependent. Settings can be also found here.
BMW with iDrive: In this case CD1 is what you can only select, and after that you can reach and control every functions of the Gateway with the iDrive control wheel.