How to made audio volume envelope effect in Video Edit SDK .Net

1. Create audio source for a specified file.

var audioFile = new VFVEAudioSource(file, segments, null);

2. Create audio volume envelope effect, 70% value used. Can be 0 - 100%.

var envelope = new VFVEAudioVolumeEnvelopeEffect(70);

3. Add audio source with effect applied to timeline. 

VideoEdit1.Input_AddAudioFile(audioFile, 0, 0, new []{ envelope });