Compile error and other questions
Ok because i thought that the animations them self had sound without you having to add it.
Here comes another question:
Apparently i can't use the texture nature/blendrockdirt_tunnel103b to make rocky textures on the walls and roofs. It only looks the same as the blenddirt texture. Anyone knows why the texter wont look like it does on the texture catalog and other maps (which i have checked)?
Blend textures are put on top of others to blend them. You want a texture like "caverockwall".
Avoid textures with "blend" in the title. Those are for use on displacements, where you can set an alpha value per vertex to blend between two textures.
They don't work properly on normal brushes.
(Look up "displacement" on the VDC to find out more.)
Other Portal 2 maps: Medusa Glare
Portal 1 maps: Try Anything Twice | Manic Mechanic
And where can I find this texture since I cant find it in the texture catalog?
I'm sorry, that's probably not the right name. Search for nature.
Nop, cant find it could somebody give me the right texture name for cave-rocky texture?
It is a nature texture. Usually it looks like a big grey surface, but that instantly changes when you make it a displacement, because it's a blend texture 
Ahh... it worked when using the displacement thingy. Thank you!