
When recording your sound, make sure you have no disturbances. In this case, I am going to use a radio mike, but it's not important.

Use a radio mike (probably easiest option, but usually most expensive).There are many other methods including Dictaphones etc, but none match the quality of a professional microphone. The biggest problem with making an ambience sound from your own home, for example, is getting the sound to your PC. I used Cubase SX2, but programs such as Cool Edit and Goldwave will work, as long as they have the ability to create cue points (and they're free). A decent mike I'm using a Technica ATW1452, but it depends on how good a quality a recording you want, and how much you're willing to pay.If you get the sound off the Internet, skip to "Creating the Cue Points". There are two methods of obtaining a custom sound - from the Internet, or from the ambience itself, using a microphone. Saved with cue points (don't worry, this will be explained!).8-bit, (newer versions of HL may accept 16-bit).11 or 22 kHz frequency (22 kHz is better quality).However, after much investigation and several heated arguments in forums, I can reveal that all sounds must be: Previously, there has been some confusion over what format a sound must have to be accepted into the game. A badly looped sound is just as bad as a badly tiled texture. This means one short sound that has been created so that the end of it will fluently run into the beginning, as with textures.

The reason? Most of the sounds in HL are looped. Custom Sounds: we all love them, we all try them, but most of us fail miserably.
