Can you spot the pop in this screen shot? It's quite obvious even without hearing it.
It's that sharp vertical mark at slightly less than the 4 second mark in the left channel (the green one). Now here's a zoom-in on that pop.
Click to enlarge. If you look at the bottom part of the shot you can see some time information. This pop occupies less than 1/1000th of a second. Seems like something so transient wouldn't be so annoyingly obvious. This kind of pop is easily eliminated by Goldwave's pop filter.