6 copyright: Ushodaya Enterprises Limited
12 description: Mix two audio tracks.
14 - Samples from the longer of the two frames are discarded.
21 The mix level to apply to the second frame. Any negative value causes an
22 automatic crossfade from 0 to 1.
28 The ending value of the mix level. Mix level will be interpolated from
29 start to end over the in-out range.
35 Set to 1 to reverse the direction of the mix.