This is technically a feature request.
What you are asking for is a custom API that would allow your software to talk to the FireStudio Universal Control software directly from command line. Currently we do not offer an SDK for Universal Control or for any of our audio interface or mixer products.
If this is for a large volume installation (dozens or hundreds of radio stations) that we would consider providing a solution with advance notice. Please contact our sales team by phone during the week at 225-216-7887 so they can assist you discussing your needs to determine if we can assist in such a solution.
Since your application is very specific and you're willing to write code to support your solution, perhaps do this on Linux using the built in amixer command line interface and the FFADO (Linux 1394 audio driver) project reports that the FireStudio Project works with Ubuntu, and BASH scripting you could probably make this work pretty easily. We do not support Linux, this is only a suggestion to your question.
If you require a Windows solution, sadly do we do not offer anything at the present time, however we are looking into possible solutions for the future.