DSP

In the context of GoldSrc and Source games, DSP, or Digital Signal Processor, refers to the audio effects such as echoes, reverberation. and such that can be applied to currently-playing sounds. DSP effects are automatically handled depending on the materials around the player and can be overridden with env_sound in , or env_soundscape in .

This list contains DSP presets available in all GoldSrc and Source engine games.

Note:In GoldSrc, when EAX/A3D is enabled in older version of GoldSrc such as WON or pre-SteamPipe (which requires compatible Creative/Aureal sound cards or by using Creative Alchemy in Windows Vista or later) or by using the MetaAudio plugin (for post-SteamPipe builds), the DSP effects can behave differently. This is noticeable on Weirdo 1 to 3, which doesn't have buzzing noise but instead have proper echoes effect. This also restore the missing surround sound support for GoldSrc.
Also in Sven Co-op, as it's uses FMOD by default, various DSP sounds will also have proper echoes effect out of the box.

Warning:While MetaAudio isn't a cheat, you may get false VAC ban for using this plugin, so remember to launch the MetaAudio-hooked game/mod with -insecure launch option.
Similarly, in Counter-Strike Online and Counter-Strike Nexon, which runs on older, but modified version of GoldSrc, while it supports EAX, it is currently unknown whether Creative Alchemy affects the third-party anti-cheat that the game used, so uses it at your own risk.

DSP Room Type (Soundscapes)

Ideal for soundscapes. Adds reverb and echo to audio. This gives the effect of sound bouncing inside a room or sound echoing back to you outside.
You can use the command "dsp_room (number)" (Source only) or "room_type (number)" to test the following effect:

Number	Name	Description
0	Normal (off)	Disables DSP
1	Generic	Default. In Source, automatically calculates DSP based upon brush geometry.
2	Metal Small
3	Metal Medium
4	Metal Large
5	Tunnel Small
6	Tunnel Medium
7	Tunnel Large
8	Chamber Small
9	Chamber Medium
10	Chamber Large
11	Bright Small
12	Bright Medium
13	Bright Large
14	Water 1
15	Water 2
16	Water 3
17	Concrete Small
18	Concrete Medium
19	Concrete Large
20	Big 1
21	Big 2
22	Big 3
23	Cavern Small
24	Cavern Medium
25	Cavern Large
26	Weirdo 1
27	Weirdo 2
28	Weirdo 3
29	Weirdo 4	(only in )

DSP System Presets

Effects used for specific scripts.

Number	Name	Description
30	Lowpass	facing away
31	Lowpass	facing away + 80ms delay
32	Explosion ring 1
33	Explosion ring 2
34	Explosion ring 3
35	Shock muffle 1
36	Shock muffle 2
37	Shock muffle 3
38	Distorted speaker 0
39	Strider pre-fire
40	player spatial (wall) delay
41	spatial delay	reserved for spatial delays
42	spatial delay	reserved for spatial delays
43	spatial delay	reserved for spatial delays

DSP Test

Used for testing audio effects.

Number	Name	Description
44	Test 1	pitch up 10%
45	Test 2	pitch down 10%
46	Test 3
47	Test 4
48	Test 5
49	Test 6	No effect

DSP Speaker Type (env_microphone)

Used with env_microphone. It distorts audio to make it sound like it's coming from a speaker (from radio, TV, etc.).

Number	Name	Description
50 - 54	Nothing	No effect
55	Loud speaker
56	Very small speaker
57	Echoing speaker
58	Small speaker
59	Tiny speaker

DSP Automatic

Min and max templates for automatic DSP creation. Not ideal for anything else.

Note:The dsp interpolator blends between two presets. For instance, a new preset is created between room empty small bright and room empty huge dull based on size of room and reflectivity. room empty vs room full is chosen based on room diffusion, i.e., how full of objects the room is. Room type, such as room, hall, or tunnel, is chosen based on the shape of the space.

number	name	description
60-99		memory slots reserved for auto dsp create
100
101
102	room empty small bright	min parameters
103	room empty huge dull	max parameters
104	room diffuse small bright	min parameters
105	room diffuse huge dull	max parameters
106	duct empty small bright	min parameters
107	duct empty huge dull	max parameters
108	duct diffuse small bright	min parameters
109	duct diffuse huge dull	max parameters
110	hall empty small bright	min parameters
111	hall empty huge dull	max parameters
112	hall diffuse small bright	min parameters
113	hall diffuse huge dull	max parameters
114	tunnel empty small bright	min parameters
115	tunnel empty huge dull	max parameters
116	tunnel diffuse small bright	min parameters
117	tunnel diffuse huge dull	max parameters
118	street empty small bright	min parameters
119	street empty huge dull	max parameters
120	street diffuse small bright	min parameters
121	street diffuse huge dull	max parameters
122	alley empty small bright	min parameters
123	alley empty huge dull	max parameters
124	alley diffuse small bright	min parameters
125	alley diffuse huge dull	max parameters
126	courtyard empty small bright	min parameters
127	courtyard empty huge dull	max parameters
128	courtyard diffuse small bright	min parameters
129	courtyard diffuse huge dull	max parameters
130	openspace empty small bright	min parameters
131	openspace empty huge dull	max parameters
132	openspace diffuse small bright	min parameters
133	openspace diffuse huge dull	max parameters