Radio experts urgently wanted

Hello, everybody.

I would like to exchange my original Audi "the Gamma" radio with a CD-MP3 radio. After I was already wanted to steal a radio, and at the same time only my car was dented, I decided for a no-name radio, since hopefully nobody wants to have it. Although I know that some of you will be laughing at me, I still tell you that I have got a Tevion from Aldi. If it's just as good as the portable CD player, then that's absolutely okay for me.

According to the manufacturer, you simply connect the ISO blocks of the old radio to the new one. Since theory and practice are mostly worlds, I now have certain problems with connection assignment. The Gamma radio from Audi has three ISO blocks on the back, in contrast to the Tevion, which has only two ISO blocks, whereby the antenna connection for radio reception is completely different. My problem is that I have too many connections in the wire harness and don't know what they're all good for.

In the appendix you will find some pictures of the Audi radio as well as the connection of the Tevion radio.

After I have a rear window antenna I do not need the (yellow) power supply of the Tevion for the electric antenna.
What is particularly confusing to me is that the Gamma has 8 connections for the speakers (two +/----20W) for VL/VR and two line-out for VL/VR and VL/VR. HL/HR ).

Questions:
1. Where do I have to connect the ignition lock (red)?
2. Where the memory backup (pink)?
3. Where the mass (black)?
4. Where exactly the +/- of the individual speakers?
5. Where is there cheap to buy an adapter for the antenna closure?

It'd be really great if someone could explain to me how to exactly displace the Gamma's cables with the Tevion.