It also helps to have software that will remove hiss and other tape noise and clicks and vinyl noise if recording lps. I had a digital copy of an old tape that I wanted to use on my radio program but the track was loaded with clicks for some reason. The spikes showed up vividly in Audacity. Just for the heck of it I ran it through my little recording software and pulled it up again in Audacity. All the spikes were gone except for two which could be removed manually.