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DSP Presets

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.

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.
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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