Real close to ordering a M13. I have used effects and had big boards in the past but sold everything. I would like to have some FX available in a simple set up. This looks like it for me. Was close to ordering the M9 but being a +1 guy have decided to go for the big guy. I hate getting something and then instantly wish I had spent a couple of bucks more for the bigger/upgraded model. A couple of questions for M13 or M9 users. 1) Can you run these units in the FX section of your amp or are they line level units? Is one better? I was just reading another thread where the poster talked about running a multi through the FX section. In his mind this ended the tone suck that can happen with FX pedals. 2) If I get an expression pedal will that give me a wah effect when using the filters? I am assuming the filters on board are autowah types. If not what is the purpose of the expression pedal for these units? Volume? Or......? 3) Is the Line 6 expression pedal good enough or should I look for an Ernie Ball pedal (I know it needs to be a 25K not 250K)? Any other comments appreciated. Cheers.