I have a problem and that’s why I built the gamma V with the single cd player and wanted to connect an mp3 player. at the single cd player is a single cd player (mini iso blue) free to which the cd changer can normally be connected by vw! if I now connect mini iso blue to the jack, at that the mp3 player and then at the single cd player switch to the switch does not come a tone and the single player switches back to normal cd! I think the signal is missing what makes cd player clear that comes from the external source music. the signal you could steal from the connection between radio and single cd player or? if so which cables in this connection give the signal! what can I do? please help