Meanwhile I managed to change some basic parameter values which have the same effect as soft knobs at a certain position AND which is storeable:
E.g. for RAM 2-7-6 (UK'Bass MS) I wanted the sound like when the 3rd soft knob (Reso) is used at full level. To change something in the mod. matrix was the wrong approach. I simply had to change the Resonance of Filter2 to an higher value (Softknob3 -> Mod.Wheel Funct. -> Filter2 Resonance).
Same success I had with RAM 6-2-6 (PPGsawsBC) which 2nd soft knob (Effects). According to Softknob2 -> Data Entry Funct. -> Delay Send, I just had to increase the Delay Send value in the Effects section (which is the same as turning the 2nd soft knob right). And this is also saveable
So ok, I think I have to learn more and more to understand. But an indirect save of the soft knob settings would be great too, so you can just frooze a sound you hear (no matter what menus or knobs you touched), and you get this sound again.