I needed to record audio while shooting a video and didn't have my handy Zoom with me. I thought to instead set up Premiere to capture the audio.
I created a new, blank project, added a mono audio track, plugged a mic into my audio interface, enabled the mono track for recording in the audio track mixer, chose the input channel, clicked the record button, saw the meters bouncing - all well, right?
Well when I hit "play" - nothing. That is, not until I dragged some black video into the timeline. Then - it worked.
This is not how the workflow is documented in Adobe's "Help and Tutorials" manual.
It should be updated at some point - or this is a bug.