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