MRCC to Control Soft Synths?

[Palomorado]

This may be stupidity on my part but here goes:

I Have the MRCC connected to my Mac via the PC connection.
I have no problem creating music in Logic and having it control external MIDI devices. It works great.

However, When I try to play soft synths on my Linnstrument (connected to USB B on MRCC) I get nothing.
In fact the blue light under the PC connection will not stay lit. It turns blue only while holding down. How do 
I get it to RECEIVE controller info?

Thanks!