Is there such a standard? I was under the impression Eurorack designers notoriously fail to agree on things like CV levels.
Here it says, for Kosmo:
Control Voltages (CV)
- -10V to +10V typical
- 0V to 10V for “normal” envelopes
- 0V to -10V for inverted envelopes
- 1V/oct for pitch/frequency control.