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I basically want to setup my Linux computer to record multiple Line ins.

The problem is I have only one line in input in my sound card.

I need multiple Line in or RCA audio inputs. I'm looking for either PCI devices or USB or bluetooth or any other cheap solution.

Reason: I have many so called 12 volt CCTV mics. They take 12v input and output RCA audio. I used a RCA to 3.5 mm converter and connected one to the Line in of my computer and that worked perfectly.

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