Now that I've wired up everything in the above mentioned way, new Problems came up: If I hit my drums, there is no response in EzDrummer despite the fact that I made every setting properly ( each drum with the right midinote, set the drumset to Alesis in EzDrummer, plugged my earphones in the MacBooks earphonejack). Do I have to Download some specific drivers? Or is it because I'm running the Demoversion of EzDrummer in the moment and the problems disappear with the full version ? I desperatly need some advice