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Update:

I just got the boards in today and the 2x20 pin with all grounds on one side is working great.

24171

Very clean signals from the MUXs.

Thanks everyone for your help.

Good call. I guess there's no real reason to skimp on pins, and it seems like 40pin is a more common size than 24.

Huh. I wouldn't have thought of using GPIOs as extra grounds. My current ground is just running from the voltage regulator.

What exactly would using the GPIO's ground accomplish? In general is...

Thanks, Mark.

OK, so perhaps I just need to intersperse ground signals and logic signals and all will be good.

I don't think the signals will be particularly fast. I'll probably poll the MUXs...

Hey all,

I’m starting to lay out PCBs for a Teensy synth and I wanted to see if I have a fundamental flaw in my design before I get too far. Any advice would be greatly appreciated. Here are the...