I have not got a KN6000.But this is what I used to do on my KN2000.No reason why it should not work with the KN6000.I used a Mini Disk recorder I set up a mic and sang and played.I used the line out connections to record to the Mini Disk Recorder,so it picked up both voice and instrument in stereo. It is hard to overload when recording to a Mini Disk Recorder so I got very good quality.I then Burned the MIni Disk to CD.----- Because the KN2000 did not have a mic input I used an alesis Microverb,this gave me lots of gain to increase Mic volume to the Mini Disk Recorder
Sincerely.
Joe Baron