If you don't engage any EQ or filter, route your tracks straight to the main stereo bus and leave that one's drive at default, it nulls with a Cubase Mix.
As soon as you engage the EQs or filters (without touching a knob) it doesn't null. Running through the mixbuses alters the sound, too, because harmonics are generated. In practice, though, with default drive it seems the saturation only acts on peaks.