How many free USB ports do you have on your computer? Mine has 3. 1 is my Audio/Midi interface. 2 is my wireless mouse and computer keyboard. 3. Is the one I use to go back and forth between printer, iRig Keys and a few other things. So, in case you run short on USB ports you might consider a midi keyboard that use midi over USB and also has full midi 5 pin DIN connectors IN, OUT and THRU. Then you have more options. You can use an audio/midi interface that operates on USB but also has 5 pin midi connectors. Connect your keyboard controller to the interface via standard midi cables. Then the keyboard and interface are essentially sharing 1 USB port. It also gives you more options if you ever want to use your controller with other midi hardware. For example; I still have a hardware Edirol SD-20 Synth. I 'can' run it directly on USB but I keep it connected to my audio/midi interface via midi cables to save a USB port and also I only have to choose my interface for my hardware midi in and out in my DAW. I don't have to switch between the two, (and others).
What model number Edirol interface do you have? Does it also have standard midi connections?

Does the noise in your head bother me ?