Hi, I want to interface with eurorack modules using a Teensy and I have some questions that some of you may be able to shed some light on.

Since the digital pins are 5V tolerant I guess these could be used for the gate input/output?

To send CV between -5V and +5V I have found schematics using MCP4822 DACs together with LN324N opamps where sending the value 0 would represent -5V (note C0), 2048 would be 0V (note C5) and 4096 would be +5V (note C10).
But how do I get data the other way, ie read -5V/+5V into the Teensy?