In stereo playback mode audio an emitter is just one of the sound sources that will be mixed with the other emitters at the requested pitch and volume. In this mode multi-channel buffers pose no problem.
In 3D mode emitters are only able to replay mono audio buffers since it is unknown how multi-channel sound should be represented in 3D space. Instead of guessing it is up to the client application to handle it properly using position, orientation and directional audio cones. AeonWave makes it easy to select one track from a multi-channel audio buffer for playback.
Filters and Effects can be applied to individual emitters to alter the way they behave. All Filters and Effects, but the equalizers, reverb and convolution, can be added to emitters. There is no limit on the number of emitters that can have filters and/or effects applied simultaneously.