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Feedthru connector

Hello in the application I want to use the 2 4ca I don't require to have the rpi permanently installed in the speaker, in fact I only want to use it to program the DSP once. But at the same time I really don't want to have to take down and disassemble the speakers when and if I need to adjust the DSP parameters. So what I was thinking about doing was to make some feedthru connectors on the rear of the speaker.

Which of the gpio pins would I need to extend into the feedthru port? Are all of them in use or is only a small subset needed if only remote programming is required?

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