Not exactly sure what the mycode would do for their profile page, but here's the code for a song:
Regular Expression:
\[soundcloud url="([a-zA-Z0-9.:/]*?)".*?/\]
Replacement (HTML5):
<iframe width="100%" height="166" scrolling="no" frameborder="no" src="https://w.soundcloud.com/player/?url=$1"></iframe>
Or Replacement (Flash):
<object height="165" width="100%"><param name="movie" value="https://player.soundcloud.com/player.swf?url=$1&auto_play=false&show_artwork=true&show_playcount=true&show_comments=true"></param><param name="allowscriptaccess" value="always"></param><embed allowscriptaccess="always" src="https://player.soundcloud.com/player.swf?url=$1&auto_play=false&show_artwork=true&show_playcount=true&show_comments=true" type="application/x-shockwave-flash" width="100%" height="165"></embed></object>
It'll accept the Wordpress code that shows up in the 'Share' box. You might want to play around with the width and height on the replacement to suit your needs.
Off Topic: I opened his profile page and still have it open, his songs are pretty good.