Yes, I have a similar problem but only when I connect my X5DR to a Dell Notebook through an USB Midiman interface (Midisport 2x2). When I connect the X5DR to my desktop computer using the same interface, everything is just fine. I am afraid too, there is not much I can do about it as I have no influence on the way the notebook's analog or USB IO ports are grounded. However, if the notebook is battery powered the disturbing noise volume is a bit lower, but still very annoying. fred ---------------------------------------------------------------- This message was sent through the Korgy Park mailing list. Mailing list info page: //www.freelists.org/list/korgypark.