| Microsoft DirectX 8.1 (C++) | 
These flags specify information about envelope segments.
| Constant | Description | 
| MPF_ENVLP_BEGIN_CURRENTVAL | Ignore the specified start value. Start from the current value. | 
| MPF_ENVLP_BEGIN_NEUTRALVAL | Ignore the specified start value. Start from the neutral value. (See MP_PARAMINFO.) | 
| MPF_ENVLP_STANDARD | Use all the information provided with the envelope segment. | 
See Also