1. Are you using e-loader 1.1? 2. Do you have a complete midi roundtrip (PC midi out to CS midi in and vice versa? 3. What midi-usb interface do you have? (Some budget 1x1 interfaces are known to have issues with sysex). 4. Can you get sequences from the CS successfully and can you send them to the CS successfully? (Is this what you mean by the gird player thing?) 5. You are correct that before a certain OS, you need to install the command prep. Were you able to do that successfully? 6. Are you getting a getting a message somewhere that says "no valid midi device has been detected?" If so, where are you getting that? 7. Have you booted the CS to update OS mode? (I forget what the keys are to press, I think its Audition and Enter).