Teensy 3 Noob question about analog read

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There are a lot of specifics here.... maybe start new thread instead of tagging on to one that's been dead for years?

Since this thread was current a library called ResponsiveAnalogRead has been used to tame analog readings for midi projects wit good results.

But you may also have hardware issues that should be addressed before mitigating any remaining noise in software; since channel interactions are indicated.
 
"As for schematic, there isn't much to it. Power the Teensy (3.3V) to the pot. Ground from the Teensy (I've tried AGND and GND)."
AGND or GND makes difference here?
 
Depending on the environment (digital noise) and the source impedance seen by the ADC, sometimes AGND will work better than GND. Best approach is in my eyes to build and wire your prototype circuit, leaving the option to use either AGND or GND, and to start a series of tests to find out which of both grounds gives you less noisy results in your specific design and environment.
 
The only difference is noise. If you had studied the Teensy schematics, you would have seen that GND and AGND are connected on the Teensy board with a noise suppressor inductor.
 
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