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You want to protect the Teensy from over voltage. It didn't want more than 3.3V on its ADC pins. The AH49E can send +5V and the CD4067 can pass it through without the clamping that you had previously assumed so you can get 5V at the Teensy. You can test this by disconnecting from the Teensy then...

That only protects the digital signal inputs, not the analogue signals. Note the asterisk that is on each of the digital control pins.

What is the purpose of Q1 & Q2? Does it allow soft power on using GPI on the Teensy?

I was suggesting a temporary experiment to test the effect of shielding from EMI, not shielding from extraneous magnetic fields. If you put a big / strong magnet on your keyboard it will give interesting (maybe predictable) results. If you turn on some high voltage arcing equipment (or similar)...

The 4067 protection looks like a useful benefit. Yes! EMF is going to be a big problem on a (electrically) noisy stage. It would be interesting to repeat your test with the noisy lamp and introduce some shielding to see if the issue is resolved / improved, e.g. connect some kitchen foil to...

If a magnet is passed accross a detector so that its north pole is over the detector at one extreme and its south pole is over the detector at the other extreme you get full range from the sensor, doubling the range / resolution. You have since explained that you are using 5V supply but...

I am reallyinterested in how you get on. I was just posting about plans (well - aspirations) to do something just like this. I was inspired by posts in this thread then posted my ideas in this thread but whilst doing that I came across your post here. My inspiration was mostly from the ability...