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[simoncn]

I might have misunderstood which low-res international streams you were using previously. I thought it was the low-res non-UK HLS streams but your latest post has made me think these streams might have been in MP3 or AAC format.

MPEG-4 AAC (iTunes) is not the same as ADTS AAC which is the output type that MinimStreamer uses for an HLS stream. This explains why the Arcam can't play HLS streams without transcoding, although this seems like a surprising omission.

You might be able to fix the WAV issue with Volumio by updating to the latest level available from this page. I haven't tried this myself but it usually helps to be on the latest version.

Another option is to enable the MIME type compatibility check in BubbleUPnP and use aac:-/wav as your transcoding setting. The advertises multiple stream types to the control point and BubbleUPnP should (hopefully) choose the correct stream type for each of your renderers.

Many thanks for the donation and your kind words of appreciation!

Edit: With the aac:-/wav setting, you might need to specify ;aac as the stream type in your playlist.

Edit 2: I have just tried the BBC HLS UK streams with Volumio 2.001 and they are playing with and without WAV transcoding.