Under Input Data Source, click Audio Device to display the following dialog box.
Audio Input Device: Indicates the name of the audio device to be used as input to the block. The default device is Primary Sound Capture Driver. If you specify a driver other than the default driver, and then move the diagram to a computer that does not have that driver installed on it, Embed automatically uses Primary Sound Capture driver.
Input Data Source/Audio Device: Indicates that the audio data is read from a Windows audio device. If you are reading data from a real device, the Run in Real Time parameter under Systems > System Properties > Range must be activated and the Frequency must be set to acceptable kilohertz value.
Sample Width (bits): Allows you to choose either 8 or 16 bits to represent the signal samples read by the audio device.
Show Icon: Changes the display of the block to 
.
Stereo: When the audio source contains two channels (stereo), the Stereo parameter should be activated. In this event, a second output connector is added to the block. When the audio source contains one channel (mono), the Stereo parameter should be de-activated.