DSP Presets

<cat>Dev.Ref</cat>
<title>DSP Presets</title>

# DSP Presets
DSP (Digital Signal Processing) is used to modify certain characteristics of a sound when it is played, such as reverb, delay, stereo effects, tone, etc.

It can be useful to make your sounds more convincing in certain situations, like giving your sound a 'small speaker' effect when it is being played through a radio.

Below is a detailed list of DSP presets created by Valve for Source engine games. The original list can be found on this [Valve Developer Community page](https://developer.valvesoftware.com/wiki/Dsp_presets).

<note>This list is **incomplete** because some effects lack a description. You can contribute by observing the preset and noting down how the effect changes the sound.</note>
| Number | Name | Description |
|--------|-------------|--------|
|0       | NULL PRESET | The default, non-processed sound. Disables map-area-specific DSP effects. |
|1       | AUTO PRESET | The default processing according to your position in the map. |
|2       | Metallic S | Decreases stereo separation and has a slight echo. |
|3       | Metallic M | Decreases stereo separation. Appears to have 2 delay effects, one quick and one slow. |
|4       | Metallic L | Decreases stereo separation. Appears to have 2 delay effects, as well as a large reverb. Lower frequencies tend to 'bounce' much more. |
|5       | Tunnel S | Small tunnel, such as an air vent. The sound 'bounces' very quickly, similar to Brite S, but with a more convincing effect. |
|6       | Tunnel M | Medium tunnel, such as a narrow train tube. |
|7       | Tunnel L | Large tunnel. Tends to have a 150hz ring. | 
|8       | Chamber S | Clean sound with a slight reverb and long echo. |
|9       | Chamber M | Same as Chamber S, with more noticeable effects. |
|10      | Chamber L | Same as Chamber M, with cleaner, more direct sound. |
|11      | Brite S | Small tunnel with thin metal walls. Tends to have a 100hz ring. Similar to HL1's air vent processing. |
|12      | Brite M | Medium chamber with a 500hz ring. |
|13      | Brite L | Powdery, suppressed effect with a 300hz ring. |
|14      | Water S | Muffles higher frequencies as if underwater. |
|15      | Water M | Muffles mid-to-high frequencies as if underwater. |
|16      | Water L | Same as Water M, with much more echo. |
|17      | Concrete S | Decreases stereo separation and gives the sound some bounce. |
|18      | Concrete M | Decreases stereo separation and muffles lower frequencies. |
|19      | Concrete L | Mostly indistinguishable from Concrete M. |
|20      | Outside S | |
|21      | Outside M | |
|22      | Outside L | |
|23      | Cavern S | |
|24      | Cavern M | |
|25      | Cavern L | |
|26      | Weird 1 | Loud echo with increased high frequencies. |
|27      | Weird 2 | The exact same as Weird 1. |
|28      | Weird 3 | The exact same as Weird 1. |
|29      | Weird 4 | The exact same as Weird 1. |
|30      | Lowpass 1 | "FACING AWAY" Decreases high frequencies. |
|31      | Lowpass 2 | "FACING AWAY + 80ms delay" Decreases high frequencies even more. Sound is delayed by 80ms |
|32      | Explosion Ring 1 | Briefly muffles all noise and returns to the previous active preset after a short time. |
|33      | Explosion Ring 2 | The exact same as Explosion Ring 1. |
|34      | Explosion Ring 3 | The exact same as Explosion Ring 1. |
|35      | Shock Muffle 1 | The high-pitched ringing noise heard when taking explosive damage. Returns to the previous active preset after a short time. |
|36      | Shock Muffle 2 | The exact same as Shock Muffle 1. |
|37      | Shock Muffle 3 | The exact same as Shock Muffle 1. |
|38      | Distorted Speaker | Extreme distortion and compression, played through a cheap speaker. |
|39      | Strider Pre-Fire | A brief, 1-second buzzing noise that muffles other sound and fades away. 
|40      | Spatial Delay | "PLAYER SPATIAL (WALL) DELAY" Sound is delayed by 100ms. |
|41      | Spatial 1 | No effect |
|42      | Spatial 2 | No effect |
|43      | Spatial 3 | No effect |
|44      | Test Preset 1 | Speeds up all sound by 10% and has a slight bitcrushed tone. |
|45      | Test Preset 2 | Slows down all sound by 10% and has a slight bitcrushed tone. |
|46      | Test Preset 3 | All sound under a certain volume is muted. Sounds fade in slightly.|
|47      | Test Preset 4 | All sounds are repeated a few times in quick succession. |
|48      | Test Preset 5 | Similar to Test Preset 3, with a higher sound threshold and quicker fade-in. |
|49      | Test Preset 6 | No effect |
|50      | Unnamed | No effect |
|51      | Unnamed | No effect |
|52      | Unnamed | No effect |
|53      | Unnamed | No effect |
|54      | Unnamed | No effect |
|55      | Seaker Louder | Mutes low-to-mid frequencies and applies distortion. |
|56      | Speaker Very Small | Keeps only high frequencies and applies slight distortion. |
|57      | Loudspeaker | Similar to Speaker Louder, with less distortion and more echo. |
|58      | Speaker Small | Similar to Speaker Very Small, with slightly more mid frequencies. |
|59      | Speaker Very Small | Almost the exact same as 56.  |


Presets 60 through 99 have no effect and will not be listed here.
# Internal Presets
These presets were created as templates for automatic DSP creation. You can use them, but description for the effects are minimal.

| Number | Name |
|--------|-------|
|100   | Unnamed |
|101   | Unnamed |
|102   | ROOM EMPTY SMALL BRIGHT |
|103   | ROOM EMPTY HUGE DULL |
|104   | ROOM DIFFUSE SMALL BRIGHT |
|105   | ROOM DIFFUSE HUGE DULL |
|106   | DUCT EMPTY SMALL BRIGHT |
|107   | DUCT EMPTY HUGE DULL |
|108   | DUCT DIFFUSE SMALL BRIGHT |
|109   | DUCT DIFFUSE HUGE DULL |
|110   | HALL EMPTY SMALL BRIGHT |
|111   | HALL EMPTY HUGE DULL |
|112   | HALL DIFFUSE SMALL BRIGHT |
|113   | HALL DIFFUSE HUGE DULL |
|114   | TUNNEL EMPTY SMALL BRIGHT |
|115   | TUNNEL EMPTY HUGE DULL |
|116   | TUNNEL DIFFUSE SMALL BRIGHT |
|117   | TUNNEL DIFFUSE HUGE DULL |
|118   | STREET EMPTY SMALL BRIGHT |
|119   | STREET EMPTY HUGE DULL |
|120   | STREET DIFFUSE SMALL BRIGHT |
|121   | STREET DIFFUSE HUGE DULL |
|122   | ALLEY EMPTY SMALL BRIGHT |
|123   | ALLEY EMPTY HUGE DULL |
|124   | ALLEY DIFFUSE SMALL BRIGHT |
|125   | ALLEY DIFFUSE HUGE DULL |
|126   | COURTYARD EMPTY SMALL BRIGHT |
|127   | COURTYARD EMPTY HUGE DULL |
|128   | COURTYARD DIFFUSE SMALL BRIGHT |
|129   | COURTYARD DIFFUSE HUGE DULL |
|130   | OPENSPACE EMPTY SMALL BRIGHT |
|131   | OPENSPACE EMPTY HUGE DULL |
|132   | OPENSPACE DIFFUSE SMALL BRIGHT |
|133   | OPENSPACE DIFFUSE HUGE DULL |

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