I stumbled over an old forum post that was a couple of years old, where a user said something along the lines of "the alternative (back) input is designed for line level signals". I kept searching and ended up finding a few more posts from different threads that all stated the same. I already know that the front input expects an instrument level signal. If that's true, this could possibly be a solution to a problem I am having, so I was excited. I am at work so I went to check the manual to confirm and there is nothing in the manual about what specific signal level the inputs are designed for. The manual only states that the alternative input can be noisier.
So were they just blowing smoke or has someone official confirmed that indeed the front input is for instrument level and the back input is for line level?