Play to Apple Airport devices

[Mudshark]

Newbie here!
Trying out Subsonic instead of using iTunes - so is it possible to direct the output from a Subsonic client to an Airport Express - or do need to load one of the PC to Airport/Airplay redirectors?
If so, can anyone suggest one that plays well with Subsonic?

I am used to being able to control iTunes using the Remote app and playing the same selection in several rooms. However, what I would like to be able to do is play one time synced selection to A & B rooms and a different selection to room C. I see that Subsonic can serve different selections to different clients - but can those clients then serve to multiple (Airport) speakers?

Thanks

[3Dscrewer]

First of all, what System you are using? There are a lot of different Versions i.e. Linux, different NAS, MAC, Windows and so on ....

Imho for Windows PC is Airfoil a good choice