Guys, thanks a lot ! I learned something today Since my sledge doesn't have MIDI through, I will search for that Quadra Thru box. And, Gary, I think you are right about the XW using either MIDI or USB. My microbrute is connected via MIDI, and IS WORKING, but the sledge is connected with usb and it doesn't even receive MIDI clock (the onboard arpeggiorator doesn't work when connected). Cheers