// The last case to consider is when a channel position in the input channel map is not present in the output channel map, and vice versa. In this case the
// channel router will perform a blend of other related channels to produce an audible channel. There are several blending modes.
// 1) Simple
// Unmatched channels are ignored.
// Unmatched channels are silenced.
// 2) Planar Blending
// Channels are blended based on a set of planes that each speaker emits audio from.