The CD changer (and CAN) protocol is what the Gateway uses, so that the car can recognize it. This protocol is a little limited, therefore you only have the Next/Previous track buttons and CD1-CD6 (buttons 1-6) for controlling the music playback*.
- 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.
*Audi/Seat/Skoda/VW: In most cases of these the Gateway also uses the cluster display (FIS) and the steering wheel controls (coding might be necessary please read section S). With the steering wheel controls you can reach and control the Gateway music (and phone) menu in the cluster display.