Hi,
that should be possible just the same as you is done with controlling Reason or Cubase (see the tutorials): use a virtual MIDI driver like Maple, LoopBE, or Yoke and select that port as MIDI OUT in Mouse Keyboard, and select the same as MIDI IN in Buzz.
Reason tutorial:
http://www.bome.com/midi/keyboard/help/rsn3_tut.php
Regards,
Florian