I just reconfigured my system(fatar midi keyboard controller-OUT- to-IN-of sound module-MIDI THRU- IN,2nd sound module-THRU-IN,3rd sound module. That's how it is now. SO far No problems. I had a friend say I really need a bigger Midi Interface. Like a 4in/4out. Therefore, everything would be handled properly. Could this cause problems in the long run? I ask since I just purchased a Midisport 2x2 to handle the input of my Fatar and Input of Vdrums. I can return it for an upgrade, if I do it within a month. Should I spend the extra $100.00 for a Midisport 4x4??? I was also using a Midiman 1x4 Thru box(as you may have seen in a earlier post)but it wasn't working with my new MS 2x2.