Zoom Room Digital Signage Audio Controls

We are running the Zoom Rooms software off of a Dell OptiPlex 7090 using a Shure P300 to process audio for the room. Is there a way we can control the audio coming from the Digital Signage library when videos are playing over the system? I know we can mute/unmute the audio from the Digital Signage, but the audio coming from the Digital Signage is too high and we'd like to be able to turn down the volume in a similar fashion to the volume control in Zoom Meetings.