How to build a dungeon soundscape
The built-in Mountain Cave's five layers with their real settings, why the drips never repeat, and how to make a dungeon worse as the party goes deeper.
A dungeon is one air loop underneath — cave wind or a low drone, around 55% — plus drips on a random layer every few seconds with randomness at 70%, and a second random layer pushed far away: loose stone, chains, something that moves. Two distances imply a space bigger than the room they are standing in.
Pick your air first
Every underground space needs a loop underneath it: cave wind, a low drone, room tone. The built-in Mountain Cave runs a wind moan at 55%, close and nearly dry. It should be the thing you notice only when you mute it. This is what stops the space sounding like a recording with gaps in it.
Add a second bed, far away and lower
One air layer reads as a room; two read as a system of caves. Put a deep rumble behind the first at about 30% with Distance at far. It costs nothing in clarity because it sits below everything else, and it is most of the difference between a cave and a cupboard.
Drips are a rhythm layer, not a bed
Put water drips on a random layer with a cadence of a few seconds and randomness at 70%. Evenly spaced drips read as a metronome and become maddening within a minute; uneven ones read as a cave. The built-in fires them every six seconds or so.
Use distance to build the corridor
The trick that sells a dungeon is having sounds at two distances. Keep the drips nearby, then add a second random layer — loose stone, chains, a far-off scream — with Distance at far and a cadence of a minute or more. Two distances is enough to imply a space bigger than the room the players are standing in.
Put the reverb on the accents, not the air
Loops start dry because a recording made in a cave already has the cave in it. The short clips are what need the space: large reverb on the drips and the stone, matched across them so the layers sound like one place. Mixed reverb sizes make a space feel wrong without anyone being able to say why.
Leave headroom for the thing that lives there
If a dungeon has an occupant, its sound needs room to be heard. Keep the ambience low enough that a growl on a board cuts through without you reaching for the master volume.
What is in the built-in Mountain Cave?
Five layers. Two of them are air and three are things that happen, which is the ratio most underground places want. Every layer that fires on a cadence has its randomness at 70%:
| Layer | Volume | Distance | Fires |
|---|---|---|---|
| Wind moan | 55% | close | Continuously |
| Deep rumble | 30% | far | Continuously |
| Drips | 50% | nearby | Every ~6 s |
| Loose stone | 50% | far | Every ~60 s |
| Roof lets go | 50% | far | Every ~120 s |
Reverb follows the same split as everywhere else: tight on the wind, none at all on the rumble, and large on the drips and the falling roof. The accents get the room; the air does not need it.
The Crypt and Dungeon Cells environments are built the same way with different furniture — one bed, a close accent, and two or three things happening further off.
How do I make it worse as they go deeper?
Build three versions of the same dungeon — dry and quiet near the entrance, wetter in the middle, and something breathing at the bottom — and save each as a scene. Put the three in one adventure so they sit together in the strip. The players will feel the descent without you narrating it.
Why do the drips never repeat?
A random layer picks a clip from the set each time it fires, at a slightly different pitch and position, and the gap between firings is jittered by the randomness dial. Two hours of the same environment never produces the same sequence twice, which is the whole reason it does not turn into wallpaper.
Next
Ready? Open Thaumaturgy — it is free, and there is nothing to install.
Updated 10 November 2026