Thanks Steven for the reply. The first shot is the code I use for the relevant Track Information display line in Now Playing:
<.Ext>, <Sample Rate>, $IsNull(<Bit Depth>,FL,<Bit Depth>)bit, <Bitrate> <Channels> $If(<Lyrics?>="",,"(Lyrics)")
The next shot shows display of all elements as expected when playing an MP3 music file:
(https://i.imgur.com/nRP41zf.jpg)
The next two shots show 2 playing radio streams, one with a 44.1k sample rate the other with a 24k sample rate; neither example show either the sample rate ("Unknown") or the channels, which is the case for every stream:
(https://i.imgur.com/np41R9W.jpg)
(https://i.imgur.com/Atw9ane.jpg)