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Alpine 7909L and aux in activation

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I have activated the line in RCAs on the back of the 7909L but I lose volume control, so I want to use the rca in from the CD changer input but I have not found a way to fool the head unit into thinking a CD changer is connected.

I read of a multi adaptor solution so I have acquired a 4913 and KCA-801B but when everything is connected together I still need to have an Ai-Net changer plugged into the KCA-801B so the head unit can switch to changer mode. Just triggering the KCA-801B unit does not work.

The last few days when I do my searches I get a lot of results pointing to this forum so I signed up hoping one of the Alpine gurus has an answer to my issue. I am searching this site but have not found an answer yet.

I am hoping someone knows of a more elegant solution of just triggering one of the lines in the CD changer DIN control cable, so I can fool the head unit and enjoy the audio signal coming into the CD changer RCAs.

TIA for any information that is provided.

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