This file defines the volume for various game situations.
The first column consists of the identifiers of various game situations where sound files are used like narrator speech for example.
Second column is filled by volume in % probably.
Third column indicates whether 3d sound is simulated.
Fourth column defines the reverb strength.

In PSTEE we have:

2DA V1.0
80
             VOLUME       3D_SOUND     REVERB_LEVEL
NARRATIO     100          0            0.0
AREA_AMB     100          0            0.0
CASTING      100          1            0.0
MISSILE      100          1            0.0
SWINGS       100          1            0.0
ACTIONS      100          1            0.0
DIALOG       100          1            1.0
GUI          100          0            0.0
CHARACT0     100          1            1.0
CHARACT1     100          1            1.0
CHARACT2     100          1            1.0
CHARACT3     100          1            1.0
CHARACT4     100          1            1.0
CHARACT5     100          1            1.0
MONSTER      100          1            0.0
HITS         100          1            0.0
AMBIENTL     100          0            0.0
AMBIENTN     100          0            0.0
WALKINGC     100          1            0.0
WALKINGM     100          1            0.0
ARMOR        100          1            0.0