The Der Riese teleporter I put on my map works fine, it's just the fact when you use it, it doesn't make any noise like the one in Der Riese. I made my teleporter where you don't have to link it to a mainframe, you only have to turn on power.

I am pretty sure you can turn on the sounds in the zone_source file somewhere.

Don't quote me though

This might help ya m8 (sorry its Zombiemodding, but it's an old tut I couldn't find anywhere else)

http://www.zombiemodding.com/index.php?topic=3516.0