Here’s the link to a good introductory review from the TGP forum. It contains pics and clips showing several characteristics of the machine.
Gundy Keller has produced several tutorials about how to get signature sounds from the Profiler. The series is called Signature tones with the Kemper Profiler. Here follows a list of the available videos till now:
Nile Rodgers Style
Brian Setzer Sytle Rockabilly
An introduction to using effects on the Kemper Profiler:
When it comes to Profiler's knobs, a small turning can go a long way.
The range for continuous parameters is 0-16383. Don't feel mislead by the display which renders the range from 0 to 10 with one tenth resolution. If you turn the soft knobs slowly, the resolution is high enough to reach each single value. If you move it faster, it will cover a 270° arc.
It takes IRs and several other methods to achieve the sound of the Profiler.
We have two scrambled data blocks in our rig files. Those contain frequency response information as well as parameters for the dynamics that have been profiled. If one simply counted the number of bytes in the files without knowing what they represent, they might wrongly conclude we use a 256 point IR.
A minimum of 1000 points are required to accurately reproduce a guitar cabinet. Framing a shorter IR with simple equalizers would fall short, when strange cabinets are profiled. A 256 point only IR with equalizers might save some calculation power, would definitely not sound better and would be much harder to handle by code.
Our processor is a dual core at 200 MHz. That equals to 400 million operations per second. We run at 44.1 kHz sample rate (44100 samples per second). Result: we have 9070 operations available to calculate one output sample. For calculating a 2048 point IR our processor requires 2048 operations (it's 1:1). 2048 operations of 9070 operations equals to 22.6% calculation power dedicated to the cabinet IR.
The amp sounds quality is happening in the cabinet by more than 50%. A 1000 points IR would save 11%, not a gigantic saving; and a 256 points IR would require less than 3% of the available power.
On this page you’ll be able to deepen the Profiler’s concept and the way it works.
The rig volume (bottom row) is made for adjusting relative volume differences between rigs for your performance. In general it should be placed on or around the middle position (unity volume).
If you do that, you should rarely see a red output LED.
We have put weeks of work into the Profiler for creating a constant volume situation. One aspect of this is that the volume is automatically finetuned during the profiling process. But this cannot be done 100% perfectly, because a perceived volume is not necessarily equal to a measured energy. One result was, that profiles with a large low frequency response gets softer and must be manually adjusted.
We changed that behavior significantly in version 1.08. Now the bass response gets less weight in the leveling process. (This does not influence the sound of a profile, only its pure volume). As some of you stated, the sound (here the frequency spectrum) of your guitar will also have an impact on the perceived volume. A Strat single coil will deliver totally different results than a humbucker on a 7 string. This cannot be anticipated or calculated.
Last but not least: The output volume of your guitar. The levels of the guitars in our company differ by more than 20 dB. That's more than a lot. Clean sound fully depend on the volume of your guitar (unless you use a compressor) while high gain sounds are mostly constant due to the compression aspect of the distortion.
This is why it' mandatory to tell the Profiler about the volume of your guitar by adjusting the Clean sens parameter in the Input menu. Please read the respective chapter in the Base Manual.
If you set the Clean sens parameter correctly for your guitar, so that clean an distorted sounds have the same energy for your ear, you have the perfect setting for your guitar:
Only minor volume differences between different rigs
No red LED on input or output.
I hope that will answer the request for an automatic leveling: it is there! Done by the machine during the profiling process, and later modified by you with the target guitar, your ear and a simple tweak of a knob.
One more thing, though, why it's good to have enough headroom on the profiles' volumes: When you put together various profiles as a performance (live use), sometimes you want a sound to be louder than the others. In that case - with no headroom - you would have to lower the volumes of the other profiles.
Lock Volume Pedal
I found out that always when I tweak the settings of a rig after a while the level was significantly lower than that of the original rig. I searched all the possible gain stages (don't forget the volume setting at the end of the cabinet menu) and still the original rig was always louder. Louder and cleaner. Now it turned out the culprit was the volume pedal. I use a volume pedal in EXP2 set as global volume pedal after the effects. But in the rig menu there is a tic where you can choose Lock volume pedal (which I did not). So in the original rig this value was set to After stomps. Now with the volume pedal locked both volumes are equal.
Changing Amp/Cab Only
You can import a cab (or any part of a rig) from another rig, no more need to store the amp/cab/effect as a preset in advance before importing. You can also use the Copy/Paste buttons to copy effects, amps, cabs, EQ tonestack, or whole sections (Stomp, Stack, Effects) from one rig to another. Or you can also use the Lock function.
Since firmware 1.5, Selective Browse has been added. You can now select Amp and then browse through all rigs. Just the amp included in the selected rig will be loaded while other elements of the signal chain stay untouched.
Q: If I change the cab on a profile and then want to go back to the original cab, do I have to reload the original Profile/Rig to get back to the original cab?
A: If the original cab is saved by itself you can just select it.
Performances & Performance Mode
In performance mode, each rig's 5 profiles are loaded onto memory all at once, and MIDI-switching between profiles within the same rig is instantaneous.
As of FW 2.2.1, the Profiler does not feature a metronome (or looper), but this may change in the future. For now, users are resorting to delays:
Take a clean profile. Add delay. Set bandwidth and center freq to 0. Mix to 100%, feedback to 100%, clocks to 4/16. Tap your tempo, then palm-mute a high string and pluck.
You should be able to switch presets and go on playing. Depending on what you want it for, this may solve your issue. I use it all the time with my students.
And, that could be saved to your Kemper as an FX preset, with an easy to remember name. It occurs to me: When the Looper comes along, it will be a built in metronome.
... And of course there is the optical metronome: the Tap button. Did anyone notice that every blinking button will beat with the tempo being tapped?
Speaker Simulator Only (w/ Traditional Guitar Amp)
Just use your guitar amp and speaker setup as usual. Then connect the effect loop send of your Amp with the return input of the Profiler. On the Profiler, disable the Amp and Eq section, as well as any overdrive or distortion stomps. Then go to any of the stomp slots and select Loop mono. Now the preamp of your amp is routed before the Cabinet section of the Profiler. Select any of that great Profiler cabs you like. It sounds awesome and will give you a really great and consistent PA signal.
You will be missing your power amp's tone through this method - any distortion/compression or negative feedback it provided will not be audible. You also lose its unique interaction with the virtual cabinet - instead you'll be getting the interaction of the power amp and cab that were used to create that cab profile.