I recently purchased the hit light sound based led controller. While it works great, I'd rather control it through a line in (from my pc). So I wanted to replace the current local on the PCB with a line in jack. I can solder and everything but don't know circuits that well so if someone with that knowledge could point me in the right direction, it would be much appreciated! Here are some pictures of the PCB.
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7/9/13 at 6:28pm