but not a proper solution unfortunately.

There is now.

Btw, Echoes+ on the 360 really rocks.

Sorry to necro, but I found a solution to the music loading error!  On my machine, anyway, but I suspect it will work for other people as well.

Just install the MP3 Source Filter.  You can get it here: http://www.free-codecs.com/download/DS_MP3_Source_Filter.htm

It's a DirectShow filter for decoding MP3s, and it deals with some typical bugs (one of which I believe is causing the crash in Echoes and DUO).  I'm also able to run some other games now that crashed before on MP3 loading (like RPG Maker 2003 games).