If you are using a myDMX buddy then you need to purchase the FULL license to use MIDI, go to store.dmxsoft.com and register the device to your account and if there is a trial try it if not then you'll have to pay for it. For pro presenter you may need a virtual midi driver like LoopBE if its on the same computer, if its not on the same computer you need a USB midi device to send midi too.