| DirectX SDK | 
Members of the CONST_DMUS_CURVES enumeration are used to define the shape of a curve in the DMUS_CURVE_PMSG type.
Enum CONST_DMUS_CURVES
    DMUS_CURVES_EXP =     2 
    DMUS_CURVES_INSTANT = 1 
    DMUS_CURVES_LINEAR =  0 
    DMUS_CURVES_LOG =     3 
    DMUS_CURVES_SINE =    4 
End Enum