I've heard/seen your video on FB.
Its a phenomenon called 'beats'. A loud often pulsing sound due to the interference of 2 notes at slightly different frequencies. Its happening when you fret 2 similar notes as the intonation of guitars isn't perfect. The frequency of the sound is a function of how close the 2 original notes are. As stated above - its nothing to do with the Kemper.
yes i feel this is the case. Thank you for your feedback