To embed a SoundCloud track in to the text of your post you can use the SoundCloud icon now available on the Boardcode menu:
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If you don't see this icon press F5 to refresh your browser.)
Then insert your SoundCloud track link inbetween the BBCode brackets:
[soundcloud] paste link [/soundcloud]
This displays your track with the Play button and allows others to see any comments made on your track: Example:
https://soundcloud.com/scuffham-amps/confuse-the-cat-by-zabukowski