Server Version#: Synology 218+ 1.19.5.3112
Player Version#: Plex for Mac 1.17.0.1376-439f8b7f
Tuner Make/Model: HDHomeRun Duo DVB-T/T2
When setting up a recording, the Library selection (where to save the recording), only allows Video-type libraries to be used. It would seem more appropriate to allow a Music-type library here.
It would also be useful and perhaps more appropriate to save the audio stream as MP3 (or other audio format), rather than using the TS video format.