Hi Floris,

You have to setup the SLA as a media adaptor first...then it will be available as an activity after setuo :

From the Main Menu choose
>Settings
>Rooms & A/VDevices
>Add/Edit A/V Devices
>Select the Room where your SLA5500 is (Living Room ?)
>Click Add
>Choose Media Adaptor
(OK now the cool part)
All UpNp Media Adaptors on your subnet should be listed
>Choose SLA5500
>Choose Learn and Match for the IR setup
>Click On Activities and Choose Listen to Media with SLA5500

From now on in the activities list for the Lving room there should be Listen....you can choose source of PC and then you will browse your media as normal. When you select a song it will be sent to the SLA.

I don't have that exact media adaptor but that is the setup procedure.

Let us know if that works !

Cheers