I'm confused now. After worrying about the distortion, i tested the modfactor just put into my mac computer via firewire-audiointerface into Logic. Switched to line level.

And, guess what? It doesn't distort. Oh man…

That means, that my amp distorts, right? But why?

It's a solid state Evans amp from the 80ies and it works fine, normally.

Is the input level to high with modfactor effect on?

But i can't hear big differences in the volume with effect on or off. (Usually the modfactor effects lowers the volume, in my opinion.)

And the amp does definitely not distort with the clean signal. Is this a frequencies problem?

Today i'll go to friendly music store and i'll test the mf on other amps.