Decided to take a day off today, so the weekend started early.
This was fun to figure out - will upload a new version to fix the issue, but if anyone has the following specific situation then contact me via PM for patch details:
Self-hosted
Is comfortable with downloading a file via FTP, editing it and uploading it.
Using IPS 4.6.x
Using v2.1.0 or v2.1.1 of this application
Audio file attachments added to content are NOT converted to a player even though configured