This extension indicates that a number of multichannel MULAW formats are available beyond the basic mono/stereo set provided by AL_EXT_MULAW. The list is AL_FORMAT_MONO_MULAW, AL_FORMAT_STEREO_MULAW, AL_FORMAT_QUAD_MULAW, AL_FORMAT_REAR_MULAW, AL_FORMAT_51CHN_MULAW, AL_FORMAT_61CHN_MULAW and AL_FORMAT_71CHN_MULAW. Note that the first two have the same enum values as the formats in AL_EXT_MULAW and describe the same format.
MULAW encodes a sample value into each byte using a non-linear encoding.
Channels appear in the following order as in AL_EXT_MCFORMATS.