Vortex Sound Research

The manual for the Fusion Mixer V3 says that the inputs accept "virtually any signal level" because they are fed directly into the tube.

Are they speaking in the context of eurorack levels and headroom, or would this apply to lower level signals like line level also?

If the gain is just such a drastic exponential increase that you could bring in and also drive desktop synths That would be amazing.

I'm just hoping to bypass buying a preamp module lol.