A want for selective transcoding for Yamaha WXA 50

[simoncn]

The '*' in '*:wav24' doesn't mean "everything". It means network streams of unspecified type (see this section). The BBC DASH and HLS streams are network streams and they are of unspecified type if the .m3u #EXTINF line for them doesn't specify a stream type (see this section). So your FLAC files and any other local files are not beng transcoded by the *:wav24 setting.