Connections

Find the output and input connections on the sound card. If your sound card has a microphone input, this may be used, but we will use only the line input in this example. If your sound card has both microphone and line as input, make sure you connect to the same input line as you selected in Measurement->Sound Card... (step 3b in the dialog).

Use a cable to connect the sound card output to the sound card line input (only left channel will be used for the measurement, so you do not have to connect the right channel input and output).