Keuleman: Thanks for the tips.
Yeah, I have Alchemy installed (great for Diablo 2 alone) but only "Star Wars Empire at War" appears in its list (not the addon, afair it had a seperate entry in the disc version). Might have thought this was due to my soundcard but I actually have two different Creative cards, one is an internal Soundblaster Z, the other is an external USB Omni Surround.
Other than that, thanks again for pointing out to the Multiplayer Lobby Patch. Always had that one installed for the disc version but did not think it was necessary for the GoG version. Installed it now (sound problem remains the same but it seems to run more smooth now).
you need to run FOC for Alchemy to realize it.....