Ok, I found it.
I configures the player with the emplode and hit the option to disable the kenwood remote and then, everything works fine for me.

I also installed the tuner module and I'm very glad that it works fine with the 2.0b3.
the visuals act fast but the radiotext scrolls not so smooth as with mp3s. But I'm very glad over all.

But there is another question. I want to buy a sony-stick-remote. Can I control the mp3 playback as well as the tuner?

Thanks alot for all the answers.