Here is a little video of how to hook up your MIDI Keyboard (think MIDI out from console) to the computer and audio module. In general it says the MIDI signal from the keyboard/console goes to the computer either directly or through an audio box as shown in the tutorial. When the MIDI signal gets to the computer running Hauptwerk it causes the virtual keyboard to play and make Hauptwerk's sounds come out the computer audio system or module. The amplified speakers are connected to the computer/audio module to produce the Hauptwerk sounds. If your Viscount has an audio input you run the stereo audio from the computer/sound module to this input to get Hauptwerk sound. This should allow you to have Viscount sound and Hauptwerk sound but only in stereo. Stereo (2 channels) is all the Free edition has by the way and multi-channel audio requires the Advanced edition.
https://www.youtube.com/watch?time_cont ... w6QK6fT4bU
Thomas