Here is a list of soundscapes for use in Half-Life 2 beta. Soundscapes are used with env_soundscape.
All soundscapes are from soundscapes.txt
Only DSP
| Name | preset DSP | 
| Normal (off) | DSP 0 | 
| Generic | DSP 1 | 
| Metal Small | DSP 2 | 
| Metal Medium | DSP 3 | 
| Metal Large | DSP 4 | 
| Tunnel Small | DSP 5 | 
| Tunnel Medium | DSP 6 | 
| Tunnel Large | DSP 7 | 
| Chamber Small | DSP 8 | 
| Chamber Medium | DSP 9 | 
| Chamber Large | DSP 10 | 
| Bright Small | DSP 11 | 
| Bright Medium | DSP 12 | 
| Bright Large | DSP 13 | 
| Water 1 | DSP 14 | 
| Water 2 | DSP 15 | 
| Water 3 | DSP 16 | 
| Concrete Small | DSP 17 | 
| Concrete Medium | DSP 18 | 
| Concrete Large | DSP 19 | 
| Big 1 | DSP 20 | 
| Big 2 | DSP 21 | 
| Big 3 | DSP 22 | 
| Cavern Small | DSP 23 | 
| Cavern Medium | DSP 24 | 
| Cavern Large | DSP 25 | 
| Weirdo 1 | DSP 26 | 
| Weirdo 2 | DSP 27 | 
| Weirdo 3 | DSP 28 | 
E3_Techdemo_01 - 06
| Name | Description | preset DSP | Position Number | Position Description | 
| e3_techdemo_gmanspeaking | DSP 10, no ambients. | DSP 10 |  |  | 
| e3_Techdemo_02 | Ghostly wind (Physics room). | DSP 10 |  |  | 
| e3_Techdemo_03 | DSP 1, no ambients. | DSP 1 |  |  | 
| e3_Techdemo_05 | Dripping cave ambient. | DSP 10 |  |  | 
| e3_Techdemo_06 | Lake, the sound of waves breaking gently. | DSP 20 |  |  | 
| e3_end | No DSP, no ambients. | DSP 0 |  |  | 
E3_C17_01
| Name | Description | preset DSP | Position Number | Position Description | 
| e3_c17_01_battle | No ambient, only position sounds. | DSP 19 | 0 | fire | 
|  |  |  | 1 | barricade gate noise | 
|  |  |  | 2 | city siren | 
|  |  |  | 3 | gunfire | 
E3_seafloor_01
| Name | Description | preset DSP | Position Number | Position Description | 
| e3_seafloor_01_sub | Strong wind. | DSP 20 |  |  | 
E3_C17_02
| Name | Description | preset DSP | Position Number | Position Description | 
| e3_c17_02_elevatorride | Strong wind and city battle in the background. | DSP 20 | 0 | elevator sounds | 
|  |  |  | 1 | city siren | 
|  |  |  | 2 | siren | 
|  |  |  | 3 | gunfire | 
| e3_c17_02_seethewall | Thundering wall noise. | DSP 20 |  |  | 
| e3_c17_02_striderdestruction | City siren and city battle in the background. | DSP 20 |  |  | 
E3_Under_02,04
| Name | Description | preset DSP | Position Number | Position Description | 
| underground_sscape_plinkohallway | Underground ambience. | DSP 6 | 0 | dripping water | 
|  |  |  | 1 | steam | 
| underground_sscape_plinkostairwell | Underground ambience, water dripping | DSP 10 | 0 | water flow | 
| e3_under_04 | Plays HL2 song 11. | DSP 8 |  |  | 
E3_bugbait
| Name | Description | preset DSP | Position Number | Position Description | 
| e3_bugbait.start | Industrial ambience with computer beeping, water dripping and metal rattle. | DSP 18 |  |  | 
| e3_bugbait.hallway1 | Fluorescent lighting hum. | DSP 11 |  |  | 
| e3_bugbait.hallway2 | Antlion burrow area. | DSP 18 | 0 | soft antlion chittering from burrow | 
|  |  |  | 1 | soft antlion chittering from burrow | 
|  |  |  | 2 | wind moan | 
| e3_bugbait.laundry | Fluorescent lighting hum. | DSP 10 | 0 | laundry machine 1 | 
|  |  |  | 1 | laundry machine 2 | 
| e3_bugbait.narrow_hallway | Distant, echo-y wet running water with dripping water. | DSP 5 |  |  | 
| e3_bugbait.showers | Big echo-y wet area. | DSP 13 | 0 | water flow | 
|  |  |  | 1 | dripping water | 
|  |  |  | 2 | water heater hiss | 
E3_phystown
| Name | Description | preset DSP | Position Number | Position Description | 
| E3_phystown.Start | A lot of alley wind with directional wind gusts and snippets. | DSP 20 |  |  | 
| E3_phystown.Indoors | Strange reversed tone with wood creaking. | DSP 1 |  |  | 
| E3_phystown.Rooftop | Quiet windy tone like passing cars with wind moan. | DSP 19 |  |  | 
| E3_phystown.Zombies | Plays HL2 song 11. | DSP 24 |  |  | 
E3_lab
| Name | Description | preset DSP | Position Number | Position Description | 
| E3_lab.LabSounds | Plays HL2 song 10. | DSP 17 | 0 | goo tubes | 
|  |  |  | 1 | computers on desk | 
d1_town
| Name | Description | preset DSP | Position Number | Position Description | 
| d1_town_warehouse_wood | Wood creaking. | DSP 17 | 0 | Hole ambient 1 | 
|  |  |  | 1 | Hole ambient 2 | 
|  |  |  | 2 | Hole ambient 3 | 
|  |  |  | 3 | Wind behind wood shutters | 
| d1_town_bigcave | Cave ambient. | DSP 25 | 0 | combine pod ambient | 
|  |  |  | 1 | support and metal creaking | 
|  |  |  | 2 | drippies | 
|  |  |  | 3 | rubbles | 
| d1_town_cavetunnel | Strange noise. | DSP 25 |  |  | 
d2_depot
| Name | Description | preset DSP | Position Number | Position Description | 
| d2_depot_showers1 | Machinery ambience. | DSP 13 |  |  | 
| d2_depot_admin1 | Quiet tone. | DSP 9 |  |  | 
| d2_depot_laundry | Laundry ambience. | DSP 18 | 0 | laundry machine | 
| d2_depot_laundry_small | Loud machinery ambience. | DSP 8 |  |  | 
| d2_depot_laundry_tunnel | Tunnel laundry ambience. | DSP 5 |  |  | 
| d2_depot_cellblock_quiet | Quiet tone with distant combat. | DSP 19 |  |  | 
| d2_depot_cellblock_quiet_cell | Loud machinery ambience. | DSP 17 |  |  | 
| d2_depot_cellblock_medium | Quiet tone. | DSP 10 |  |  | 
| d2_depot_cellblock_big | Quiet tone. | DSP 19 |  |  | 
| d2_depot_cellblock_small | Quiet tone. | DSP 17 |  |  | 
Generic and Soundscape Test
| Name | Description | preset DSP | Position Number | Position Description | 
| Nothing | No DSP, no ambients. | DSP 0 |  |  | 
| GenericIndoor | Fluorescent lighting hum. | DSP 1 |  |  | 
| GenericOutdoor | Electric hum like above with a motor / gas / wind kind of sound in the background. | DSP 19 | 0 | Quiet electric hum. | 
|  |  |  | 2 | d2_depot_cellblock_medium | 
| Cabin | Medium-low sound of fire burning or rumbling; soft clicking; a slightly louder four-tick rhythm followed by a release or exhaust sound (ahuugha). | DSP 17 | 0 | Faint banjo-like TV music. | 
|  |  |  | 1 | Regular melodious whirring sound, like a small engine trying to start or a sump pump kicking in. | 
| cabin_outdoor | Faint ambient white noise or rumble with occasional bird twittering. In the background, a faint but noticeable medium low sound that regularly builds up and then drops off before beginning again: wwwwwwwwwwwww - enuu. | DSP 20 |  |  | 
| test_tvset | Music coming from a TV set | DSP 1 | 0 | Banjo-like TV music. | 
Kleiner's Lab
| Name | Description | preset DSP | Position Number | Position Description | 
| E3_lab.LabSounds | No ambient. | DSP 17 | 0 | goo tubes | 
|  |  |  | 1 | computers on desk |