Reply to Midi Fighter Spectra is causing my computer to wake up.

Anyone else having this problem? I can't put my computer to sleep without it automatically waking up. I've ruled out all other causes because when I unplug my Spectra my computer sleeps fine. I've tried going through my device manager and power options but I can't find anything that would disable the spectra from waking up my computer.

OS:
Windows 8 Pro 64bit