One note of warning, the built-in compressor of the Kemper is based on a vintage stomp style compressor and does not have the traditional parameters one would expect based on a typical rack or studio compressor. Pulling from the manual (Page 158):
Intensity
Controls the amount of compression applied to your instrument. At zero position, there is no compression. In the first half of the Intensity range the effect will be fairly subtle, as the compressor will only cut the loud attacks of your instrument. Then, as you increase “Intensity” past halfway, you will start to hear the soft notes getting boosted as well.
Attack
Adjusts the reaction time of the compressor. The higher the “Attack” value, the longer it takes for the compressor to kick in. This will let the first peak of the signal pass unaffected when you hit a string, thus increasing the percussiveness of your pick.
Squash
This gives you control over the dynamic behavior of the compression. At the center position the compressor will work as you expect. When you turn “Squash” towards zero, the compressor will emphasize the first phase of the strings’ decay, resulting in less squash. When you turn it more to the right, the first phase of the strings´ decay gets squashed, and the volume sags. You will notice that the compressor recovers from squashing when you let the strings decay further - even boosting the sound a little, compared to when you hit the strings. Now, the compressor becomes noticeable!
“Squash” does not change the compression ratio, as this is always infinite on vintage stomp compressors.
Jeffro
If Kerry and Jeff ever put out an instructional video, I'm pretty sure it would be just 50 different ways to tremolo pick and randomly grab whatever notes happen to be under your fingers at the time. Paul Gilbert precision dudes they were not. 
