Make sure the machine is in "Computer" mode. Press the button on the TASCAM or launch the driver front end from the PC. That will bring up the all-useful control panel. You then enable Mackie mode in the driver. There's a drop-down. Set a plausible sample rate etc while you are at it, and a buffer say of 256 for openers. In addition to the audio ports, the driver will map the device as 4 MIDI ports and one or more CONTROL ports. What you want to attach for Surface Control is the primary CONTROL port, not the MIDI ports, I forget the exact names they use, you'll see it. When you have all that working, don't overlook the useful Soft LCD simulator. With Cubase I usually put it on the second monitor with a Mixer view. It's very handy. In Logic it's insanely useful as the program is constantly remapping the channels and the rotaries, for instance if you start digging into a track, what sends it has, Logic assigns the channels on the Tascam to the main track, then to the aux busses you are addressing, the master out, inserts etc. Which is very sweet but confusing as hell. So the Soft LCD helps. Oh, BTW, if you are running the FW1884 with OsX over Network MIDI, Soft LCD displays on the bridge machine, in my case the Windows PC. That's great if you have a screen to devote to it.