Macromedia flash media server 2-client-side actionscript language reference for flash media server 2 User Manual

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Microphone class
51
The 
MovieClip.getNextHighestDepth()
 method used in this example requires Flash Player 
7 or later. If your SWF file includes a v2 component (version 2 of the Macromedia 
Component Architecture), use the DepthManager class from the component framework 
instead of the 
MovieClip.getNextHighestDepth()
 method. 
See also
Microphone.rate
Availability
Flash Player 6.
Flash Media Server (not required).
Usage
public rate : Number [read-only]
Description
Property (read-only); the rate at which the microphone is capturing sound, in kHz. The 
default value is 8 kHz if your sound capture device supports this value. Otherwise, the default 
value is the next available capture level above 8 kHz that your sound capture device supports, 
usually 11 kHz.
To set this value, use 
Example
The following example saves the current rate to the variable 
original
:
var active_mic:Microphone = Microphone.get();
var original:Number = active_mic.rate;
See also
Microphone.setGain()
Availability
Flash Player 6.
Flash Media Server (not required).
Usage
public setGain(gain : Number) : Void