Re: Kemper - what's the point?
You can profile your own amps with a Kemper. You can profile any amp you want. There are tons of forums out there sharing profiled amps so you are not limited to what it ships with. From a Premier Guitar review:
While the Profiling Amplifier looks like it would be at home on a very advanced alien spacecraft, the profiling process itself is surprisingly simple. To set up a profile, you warm up a tube amp (solid-state amps work, too), plug a guitar into the Kemper’s front input jack, and run an XLR cable from the Kemper’s rear-mounted XLR jack to a microphone set up to mic the source amp’s speaker. Then, you complete a loop by running a patch cable from the amplifier’s input jack to the Kemper’s 1/4" direct output/send jack. Through this loop, the Kemper captures the tone DNA of the tube amp. It’s sci-fi stuff, but it works.
The process is also surprisingly fast. You set the 5-way rotary chicken-head knob on the left side to the profiler setting, and the LCD screen gives you easy-to-follow instructions. You play through the amp you’re profiling and, using a pair of headphones, listen to how it sounds through the mic. Once you have an accurate sound picture of the amp, you start the profiling process. The Kemper sends out three pieces of garbled noise to the amp’s input that represent high-, middle- and low-frequency ranges. It sounds a little like a fax modem running through a Big Muff, but don’t worry—these signals are designed to evaluate how the amp’s circuitry and cabinet react to the input. The mic picks up the signals as they come out the other end of the amp circuits and cabinet, and then sends them back into the Kemper for processing—the end result, as strange as it seems, is a super-accurate profile of the amp’s unique dynamics and response to different frequencies and signals.
Once you create a basic profile of your amp, you can fine-tune it in the amplifier portion of the stack section (top middle of control panel). Here you can alter power amp sag, dial in vintage or modern response qualities, adjust the level of compression, and even how much pick attack comes through. The cabinet’s voicing and size can be changed, too.