I do not know what "baum;s mouse and keyboard" is? It does not sound like a virtual MIDI keyboard like the one I linked to above. The virtual MIDI keyboards that I have seen have an option to set their output. The setup should be as simple as installing the virtual MIDI cable, launch SONAR, select the MIDI cable as input, launch the virtual MIDI keyboard, set the output to the virtual MIDI cable. Deselect and forget about the Microsoft GS Wavatable.