DMDX Help.

Volume Keyword

<Volume N>
<vol N>

    Switch that specifies the volume of a sound frame (not a streaming audio frame). The volume is specified in hundredths of decibels (dB). Allowable values are between 0 (no attenuation) and -10000 (silence). The value 0 represents the original, unadjusted volume of the stream. The value -10000 indicates an audio volume attenuated by 100 dB, which, for all practical purposes, is silence. Currently DirectSound does not support amplification. Default value is 0.

DMDX Index.