This is how I record from PRO-52 into Vegas Video, if your sound card has at least 4 outputs, and wave and ASIO drivers ( I have the MOTU-2408 )
1 Have Vegas set for its own outputs (Wavedrivers 1&2)
2 Have Pro-52 set up for its own outputs (ASIO 3&4)
3 Run PRO-52 outputs into your mixer channel (lets say 7&8)
4 Arm a track in Vegas select your Rec inputs (1&2)
5 Set up the PRO-52 track on your mixer to be recorded into Vegas,
6 Check to see if you can now play PRO-52 and that you are getting a level on the Vegas track. If you need any help please feel free to e-mail me.
BTW download the 2.5 PRO-52 update
Hope this helped
George Ware