The K4's send active sensing to the midi out. On page 95 of the manual it shows it in the midi implementation chart. However it does not show there is a way to shut it off??? Maybe try shutting off system exclusive or another setting to see if it stops. If it's not active sensing use midi-ox or a similar program and see if it is another type of message. The K4r should not be sending false pitch bend or mod wheel messages since it doesn't have the keyboard like the K4. There isn't any midi clock shown either.
