USED FOR A CUSTOMER DEMO. AS NEW IN ORIGINAL BOX. FULL MANUFACTURER WARRANTY. The Kemper Profiler Rack from Kemper is, as its name suggests, a digital processor that profiles the way a particular guitar amplifier and cabinet function acoustically, and through capturing that information, is able to accurately reproduce the original tone of the amp with all of its details. The unit allows the guitar player to transfer his personal signature sound into a rack-mountable amplifier and summon the sounds up anytime, anywhere.Profiling is done by simply inserting a particular tube amp into the Kemper Profiling Amplifier and pressing "record." Test signals are sent from the profiler amplifier back into the tube amp and recorded by the microphone in front of the guitar cabinet. A convenient and accurate A/B comparison mode is provided to make sure the profile accurately matches the original tone. That profile can then be played back from the Kemper and further adjusted with EQ, effects, and the included stomp pedal models.The unit is especially useful for the touring musician. Now instead of carting around a heavy and perhaps rare or fragile vintage amp, the performer needs only to carry the rack-mountable unit that contains a multitude of profiles and settings that can be adjusted in real-time. It should be made clear that the Kemper Profiling Amplifier doesn't simply output a list of static digital amplifier reproductions, but rather creates a vivid, living, dynamic and multi-dimensional image of the existing tube amp. Features: The Stack: Amplifier Section, EQ Section, Cabinet Section The Effects: Virtual Stomp Boxes, External Effects, Master Section The Connections: Input Stage, Output Stage, Ground Lifts Amp Definition parameter determines whether the Profile leans more towards a vintage or modern character - increasing this parameter intensifies the touch response of the virtual tubes. Power Sagging parameter lets the tubes breathe with individual playing styles - damped strings will have more "chug," and clean picked notes will cut through better when the playing volume is reduced. Pick parameter controls the attack of the pick independently of the gain setting, even through heavy distortion. Amp Compressor will sustain the clean guitar when playing soft, but lets the distorted sound through, unprocessed, when reverting back to normal playing volume. Cabinet Voicing parameters provide access to the character of the cabinet - the size of the virtual cabinet can be changed, the bass resonance tuned, or the tonal character controlled in creative ways