Thanks for the help on my problem,I will now proceed to clear all my stuff and connect one device at a time. A trip to my local dealer with the unit is in order also.I failed to mention the the KN is on it's own internal amp so this appears to be radiated noise from the keyboard itself. The Hammmond has a line out from the preamp so I can understand some noise can be picked up from power supply switching but the Rolands have been rock solid thru all forms of patching abuses.Intersting and great fun to talk to some forum members,I.ve been reading all the posts for several years and rate you guys no. one Thanks again Jax