When you have your bcf updated to firmware 1.07 (you can verify by turning the bcf on and off, the lcd display wil show what firmware version it's running) . turn the bcf off and now turn it back on while pressing the fourth pushbutton from the left just under the rotary switches on top of the device, the bcf is now in sonar mackie emu mode.
Now the only thing you have to do is set up the control surface in sonar, just open up sonar and in the options menu select control surcafes, a menu pops up in wich you can add a new surface, add one select mackie control and for MIDI in/out choose the BCF, if the bcf doesn't show up in the drop down maybe it will say usb audio device then choose that one.
close the dialog and you should now be in control !!