Here's how:

- Go to Setup
- Enable Direct Sound
- Select the SFX Button
- Select Compressor and click Add.
- Under Compressor Properties use the following settings
- Gain = Adjust for how loud you want people to be. (I use 15)
- Attack = 0.01
- Release = Around 500
- Threshold = Around -30
- Ratio = 100
- Pre delay = 4.0