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[simoncn]

Don't change what's in the .m3u files. The details there are the original quality of the stream and this should not be changed. To enable WAV24 transcoding, you need to do two things:

1) Download and install FFmpeg on your PC (see this section)

2) Add aac:wav24 to the stream.transcode property

I will be interested to hear whether you hear any improvement in sound quality.