Hi Bob,
Make sure your microphone is muted so it will not pick up sound.
Click Record, and then let Sound Recorder run for 60 seconds.
After Sound Recorder stops recording, click Save As on the File menu, and
name the file Blank.wav.
Click Insert File on the Edit menu, and then insert the Blank.wav file that
you saved. When you do this, the maximum recording time is increased by 60
seconds.
You can repeat this step once for each additional minute of recording time
that you want to add. For example, for a 5-minute recording time, insert the
Blank.wav file five times.