Paul, thank you for continuing to evolve this amazing platform.

I've been working on a Teensy3.2 based project using onboard ADC with a 2.5v AREF. I would love to step the project up to a Teensy4, but didn't spot an AREF pin on the pin diagram. Is the Teensy4 using an internal AREF? If so, is the range adjustable or is it locked?