Very few (if any) CD-ROM drives can extract audio perfectly from audio CDs at their normal (i.e. maximum) speed. When audio extraction errors occurred, you can hear clicks, pops, or hissing within the track.If you want to achieve perfect audio extractions, to burn perfect audio CDs, you have to slow down your CD-ROM drive. MacCDSpeed achieves this, preventing clicks, pops, or hissing.