I had this issue both Friday night and last night with the KPA.
A loud low end type feedback sound came out of the KPA in the middle of 2 different songs.
Straight away I turned the guitar volume to zero - made no difference
so I turned main volume down to zero ...made no difference
Finally I turned monitor to zero - made no difference
The desk was getting the same horrible low end feedback tone.....
I had to restart the KPA to stop the sound.
The second time it happened was last night .... I had a different cable to KPA , different cable to monitor , different XLR's to FOH
Both gigs were with different bands , different venues , different cables , different monitor cab , different desks .... the only similar pieces of gear used were the guitar and the Kemper.
This is the first time in 4+ years that I've had this issue.I updated to 4.0.1 last week.
Has any one else had this problem ?
Any thoughts ?
I haven't opened a ticket yet but may do so in the morning once I check that the guitar is ok