This is a question for some of the "older mappers" who used to make maps before source.
I'm working with Hammer 3.5 in a non-source version of Half-Life.
I place an ambient_generic, set the properties as they should be, but when I trigger it in the map by running through it, I only hear a split second of the wav file.
However, if I quicksave the map and run through it by quick-loading it right away, then the wav file plays.
Any idea why this might be happening?