Some qustion about the distance and capture

Im new to openal, and I met some problems while trying to use it.
1.Does the AL_SPEED_OF_SOUND affect the listener? Will it apply a delay
between listener and source while the distance is long?
2.Could the capture functions be used to capture what listener hears?
3.How does the gain works?I called the function
alDistanceModel(AL_NONE), but nothing happens. Then I tried to call
alListenerfv(AL_GAIN,AL_NONE), it gives out an error.
Thank you.:-)
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