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Need help with wiring mono jack

Okay, here's the plan. I'm taking a children's keyboard from goodwill and adding... *a mono jack (second pic) *a switch for choosing between mono output and the internal speakers (last pic) *a strap I just have a few questions reagarding this project. First off, could the mono jack possibly be over-powered and mess up an amp? Finally, should I use stranded or solid hook-up wire for carrying the signal? Both are copper. I appreciate any help you can give on this subject.

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