In the context of Half-Life 2 and other Source games, DSP, or Digital Signal Processor, refers to the audio effects such as echoes, reverberation and similar which can be applied to currently playing sounds. DSP effects are automatically handled depending on the materials around the player, and can be overridden with soundscapes (env_soundscape).
This list contains DSP presets available in all Source Engine games (except for CS:GO with the introduction of HRTF audio algorithms).
|0||Normal (off)||Disables DSP|
|1||Generic||Default, automatically calculates and chooses from below.|