bhyve Redirect Sound Output to Virtual Input

Good day,
I'm running GhostBSD (have also tried with FreeBSD 14+desktop environment) as a VM using bhyve. I have linphone installed, I can make calls, and the audio appears to be working. I say this because linphone has an volume bar that is active as sound is being generated. The issue I'm having is when I try to run BUTT (pkg to stream to an icecast server) but it is finding no inputs. The developer of BUTT tells me I need to somehow direct the output of linphone to the input of BUTT with perhaps a virtual input.

Is there a way to create such a virtual input for BUTT to use?
 
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