Thanks for the explanation! I'll give it a shot sometime.
When you get the DI do you get to set the mic/position? Or does it come set in the profile?
The DI is just the amp, before it gets to any speakers - like if you just plugged e.g. a JCM800 head straight into the mixing desk instead of into a cab. The speaker/cab/mic(s)/mic position(s) - that's all contained in the IR. If you're not sure what IR's are, google "Celestion digital" or Ownhammer IR" for more info. When you buy a set of IR's, for any given cab or speaker you'll generally get a good range of options of mic type and placement - this is how you customise the tone to your tastes, by finding an IR which complements the raw amp tone contained in the DI profile. There are a bunch of free Celestion IR's included with the Kemper btw, and most companies offer a few free samples too.