Unable to utilize my m-audio keystation 61es with n-track. Can not find option to specify USB MIDI controller for input. I set the sampling frequency in n-track to 48000Hz for my Creative Sound Blaster. My computer recognizes the USB hub and the keystation 61es controller, I'm also able to use piano roll without any problem. Looking at MTC/MIDI Clock Sync for possible options, but nothing workes. Thanks for any suggestions.