I have touch buttons and I noticed that there is a higher level of noise while buttons are highlighted (highlight turns on after touching the button, and the 2 sec later it turns off). Besides that I haven't noticed difference in quality between the RKP Radio and standard one in a menu.
And yeah, I haven't included volume control here(it is set to 30). I will add it soon. Although I have couple of ideas. For example an automatic scan of the whole freq range and show the signal level on a diagram to make it visible where is the signal and where is the strongest signal. I am thinking also of radio teletext support (the text broadcasted parallel to the music stream, its supported by most of car hi-fies where you can read the name of the song, time or just name of the radio - whatever they sending at a moment). Also I will experiment if spectrum analyzer is possible. I don't know for sure about that because by standard it is not enabled.
I have some weird ideas also about that. For example to make app that would receive through FM a file, or bitmap sent by computer connected to fm transmitter :-)) I know its possible, though with very very slow bitrate. But I just like to create some weird stuff
I know most 2706 dont support rkp platform but I heard that some of the do.