Back on the Silverlight 5 beta, I ported an old Expression Blend sample to use the new XNA low latency sound effect classes in SL5 ( post is here ).

I thought I’d take a look at it under the Silverlight 5 RC – the only changed that I had to make was (it seems) to reference Microsoft.Xna.Framework in order to pick up the classes for the sound effects so it looks like some types moved between the beta and the RC but, other than that, all was well with that sample (including the touch support I put into it).