www.nektartech.comNektar Impact LX49+ & LX61+ User Guide21USB Port Setup (A2)Impact LX+ has one physical USB port however there are 2 virtual ports as you may have discovered during the MIDI setup of your musicsoftware. The additional virtual port is used by the Impact DAW software to handle communication with your DAW. You only need to chan-ge the USB Port Setup setting if the Impact LX+ setup instructions for your DAW specifically advises that this should be done.