7th once promised me a fully functional server stats page, like HLStats, the only difference is that he wanted to code it himself. Perhaps we can install HLStats until then? The problem is, i don't know how to install HLStats, since its PHP/MySQL based. I lack experience on those.
As far as i know only one cue point should be used and placed at the beginning of the file. I use Goldwave and the file loops fine in HL. Try placing one cue point at the beginning of the sound.
Place an env_sprite. Name: spr_red_green Flags: Start On: checked
Place another env_sprite Name: spr_red_green Flags: Start On: unchecked
Place a multimanager Name: spr_red_green_toggle
Turn off SmartEdit. Click add.
Key: spr_red_green Value: 0
Click Ok. Click add again.
Key: spr_red_green_toggle Value: 0.5 (this is the delay between the flashes, in seconds)
Flags: Multithreaded: checked
To make an explosion, use an env_explosion (doh), or use a func_breakable with an explosion magnitude value. To make aliens float around, use a trigger_push, and cover everything where you want to have zero gravity. Then just place monsters. This may not work very well, since monster are not able to move when in mid air.
To create atmosphere maybe? A dark map has this so called, i don't know, "horror" feeling perhaps. Or their monitor gamma and/or brightness values are set too low.