I understand that you want to know how to adjust the Slingbox audio settings without installing the SlingPlayer software on your computer.
If the AV source has already been setup and it is streaming the analog audio signal, you will need to reset the Slingbox and run the configuration one more time. Once you use the Digital cable (orange cable) to connect the Slingbox to the AV source, the configuration will recognize this connection type and will be automatically set to Digital audio. If you do not know how to reset your Slingbox, check this article:
Hope this helps!