- simply added the ambient_base sound to the game. its actually a very small sound file, so we could layer on other ambient sounds on top that are queued by different parts of the level in the future if we wanted.
- because this is an activeSound it is also effected by the bug where if you save and reload it is no longer playing (just like the current glados voice line activeSound)
- tested in entire game seems to work well.
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