Ok, now to your issue, what you hear sounds like a damaged input transistor or opamp, I know that from working with audio far too much, it seems your processing line is damaged somehow, The problem is electric, with a simple ground problem, it would be only a 60Hz hum or some craclick while playing, but your crackling comes from the noise floor.
Open a ticket as soon as possible, send the audios to kemper support through mail. Sorry to bear bad news to be honest, there has been more issues with the stage than ever were with the other units, I believe some of the design compromises to encapsulate all the components in a tight space is responsible for most of the problems. But who knows...
Thanks for taking a listen. With all the self testing I've done, I figured the problem was somewhere within the "input" components of the Kemper. Glad to know you think the same, sounds like we are identifying the true problem.