Most commercial impulses like Redwire or Recabinet uses a flat power amp meaning it essentially takes it out of the equation. A lot of impulses keep the power amp engraved in the fliter yes, but definitely not all. Add the fact that the 6505's tone relies quite heavily on the power amp section gives plenty of reason to want to record pre and power amp. Okay, admittedly I had always assumed a line out was pre and power amp. I've never needed to use one before. The point still stands though, why give these options without the ability to have a pre and power amp output with no annoying EQ filter disguised as a mic sim?