distortion

[dr. orange]

I know, it's my third thread, but I really wonder whether there are things that are not normal with my machine:
the hypersquare sync is one thing, the distortion issue is another:

I thought you wouldn't notice any filter distortion unless the "OSC VOLUME" parameter is >0. However, if I activate a distortion, let's say "Hard", I can even experience it below the value 0. Is this normal?

[Timo]

That happens even with my old Indigo 1.

It's the same with both filter saturation and distortion effects.

Kinda odd, but it's obviously intended.