SL_I3DL2_ENVIRONMENT_PRESET_UNDERWATER

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
extern (C)
enum SL_I3DL2_ENVIRONMENT_PRESET_UNDERWATER = SLEnvironmentalReverbSettings(-1000, -4000, 1490, 100, -449, 7, 1700, 11, 1000, 1000);

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