I would prefer to keep the audio signals isolated from the data board so would prefer not to connect the audio ground to the data board's ground and then switch the signal pins using transistors but would this be best? What do people think..... This is effectively like a computerised source switch for an amplifier.
Input A only goes to B and/or C OR noneInput B only goes to D and/or E OR noneInput C only goes to F and/or G OR none....
Each line could be handled by 2 relays but solid state relays are not cheap and mechanical ones are expensive so looking for electronic suggestion really....
The relay will be switching both the signal and the audio GND lines
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