Custom audio files not playing in-game
@AD_79p2: What are the specifications of your custom sounds? do you know they must be 44100Hz sample rate?
useful tools and stuff here on TWP 
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How do you check the sample rate?
You check it in whatever audio editting program you are using right before "Save as...". Normally there is a tab for the specifications for each format (.mp3 .wav etc.) you want to save your audio as. Though anyway, it must be displayed somewhere at your working window (this depends on each software, just look for it.)... or in options, you sure have a default settings window to set your desired rate up...
Also, AD_79p2, you mean "in game" when in the Workshop or normal .bsp run?
useful tools and stuff here on TWP [spoiler]
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The map is not on the workshop, "in game" meaning when I test the map.
BTW I don't actually have an audio editor, I'm just using a text-to-speech demo I found online.
look up xilisoft, its what i use for video and audio converting
Alright, Fracture, I'll try it and see how it works.
So, how do I get the sample rate down to 44100 or whatever it was? When I converted the .wav to an mp3, the sample rate was changed to 48000.
Hell yeah, FelixGriffin, that looks like it will work really well. I just hope it's not too hard to use.
OFFTOPIC: Have any of you ever played Super Meat Boy? (I don't quite know why I just wrote that).