Penny pinching again 
Any idea where the top audio jack P_L OUT connects to ?
I’ve succesfully burned code to the two attiny and am in the process of breadboarding . Fingers crossed. So yeah , any ideas ? Thanks.
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As far as I can tell from looking at the pictures and the routing on the PCB (top and bottom, the jack just connects to the “I/O” pin socket. This means that you can patch anything into the output jack.
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Thanks for having a look… yes that may well be it . A bit confused, still need to fully digest the overview/ manual but looks like it is just a patch point for the jumper wires 
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Yep, that’s correct. I’ve built an original Kastle on a stripboard myself, it’s a hell of a lot of noisy fun…
(Thumbnail isn’t the finished project!)
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Good stuff , getting around to firing it up ( drum version). Will probably post some results cheers
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