I just got one of these 24 channel Mackie d8b boards for free. .   I want to use it as a DAW controller. Ive done some research but I cant really figure it out. The board has a midi ext slot. can I just plug in this midi and run MCU through it ? Or do I need the ProBox serial/usb box ? Thank you for any help. I know this isn't a direct Cakewalk only question. but I am trying to interface to it.