Hi Bill,Had my Bose from May.2010. I put a jack in the headphone socket to mute the onboard sound as this helps me control the room sound. I use the onboard EQ as I do not want to distort the sound. Another tip Bill, I always have a spair set of leads from the Bose to the keyboard as a back up. Bose set at 1pm and keyboard 11am. Best wishes. Roger