I investigated this when I bought a V7 also. How about one of you electronic geniuses create a circuit board that would do this job for us? It would have two inputs (radio and Vario) and one output to the speaker. It would pass the vario signal through until a radio signal is received. This would allow us to separately adjust the volume of each from the instrument just as we do now. If someone draws it up, I'll fabricate it or hire it out.