Maybe. I'm not sure what thell I'm talking about right now. But I think this clears it up for me:
OK, I'll experiment. I have the choice of plugging my guitar into a switchable "Guitar/Line" input and putting that on "Guitar"....OR.....I also have the non-pre-amped inputs in the back of the unit.
I guess whichever one gives me a lower signal when I plug my guitar into it, would be the one that would get me closest to a guitar pick-up level?
Well you don't just want "low signal", you want THE signal. Ideally you want exactly what the guitar puts out, no more, no less. That's why a "guitar" in is useful, or an input that bypasses the preamp. If you can get that, you're halfway there. From there, if you can get that pure unaffected signal back out to the amp at the same level that the guitar naturally kicks out, then you're pretty much all the way there. That way your amp will respond like an amp that actually sees a guitar....for the most part.
To hear the difference, just try it and see how your gear reacts. Record a direct signal, reamp it the way you wanna do it, and save the track. Then plug your guitar right into the amp with the same settings and record it. See how the two tracks differ.