Open the dialog box shown below from Measurement->Sound Card....
The sound card settings will be explained step-by-step in the next sections.
 Step 3 - Select mixer (volume control)
Step 3 - Select mixer (volume control)
 Special case: Using the Windows mixer directly
Special case: Using the Windows mixer directly
 Multi-channel (>2 channel) measurements
Multi-channel (>2 channel) measurements
 Settings for doing a 1 channel transfer function/impulse response measurement
Settings for doing a 1 channel transfer function/impulse response measurement