> Internally, the THAT represents quantities using a range between -10 and +10 volts.
So it looks like you only need to attenuate that a bit to get to Eurorack voltages.
Nope that should be fine. Most eurorack modules run on ±12V rails, but the convention for output signals in the maximum ±10V range (with trigger signals at 10V).
Sure. You can think of a modular synthesizer as a domain-specific analog computer for audio signals.