High impedance = feedback in my experience working with the girls www.tributeartistes.com - I always record my radio programmes using a load impedance mic through my KN7000.
Rog
p.s. I reckon the only reason Derek can't get his microphone to work through his KN7000 is because he's not set his keyboard up properly to accept that input.

[This message has been edited by RMepstead (edited 10-23-2010).]