***In relation to Amp Sounds/Tones and specifically to the 11R*** You cannot vary up the input impedance (aka use the True-Z) with the 11R unless you put an effect in there first... and even then, you are varying up the input impedance of the first effect - NOT the amp. That's why I am a bit flabbergasted with guys promoting the True-Z on the 11R as the key to the dynamic and realistic tones they are hearing from the 11R Amp Tones. The amp input impedance in the amp block is not adjustable in the 11R. Only the effect blocks are and even then ONLY the first block is. It is set automatically by the 11R based on what effect you put in the first block. If you used a Radial Dragster to vary up the input impedance.... any change - and there is a change - could be done perceptually through EQ and the results are very close. This is the same thing as changing the pot values on your guitar's volume pot. 250K vs. 500K for instance. The load on the pickups, presented to the pickups, is different and adds up to a different sort of tone - darker or brighter. This stuff isn't new, it wasn't introduced by Digidesign or Fractal - it's simple electronics. It's always been there with every effect pedal from back in the '60's. This isn't new. Every guitar does the same thing if it has pickups and a volume/tone pot. Let's be honest - 11R marketed it first and did it right. True. But they didn't invent this stuff; they just acknowledged reality from decades of what the analog world is and how it works. So my point is/was that all the talk of the 11R True-Z as some magic bullet for killer amp tones from the 11R are simply misguided and incorrect. Again, if you think I am full of s*** and disagree, then roll with it and don't mind me.