OpenAL plays the sound even if the engine is out of focus. Thanks!

...only it appears unable to play the sounds I used. I'll export them again and see if that fixes the problem.

EDIT: Out of the 20 sound files I have, only one can be loaded with OpenAL for some reason. This sound was created from scratch within Audacity. The rest can't be loaded, even though they could be loaded before (snd_createoal returns NULL for those sounds).