Editing audio in Qtractor is done directly in the workspace, with a small set of powerful tools. There are three types of audio within the Qtractor workspace:

You can edit and effect the latter two; the first (the audio file itself) is merely referenced in Qtractor and cannot be directly manipulated by any of Qtractor's tools. In fact, it should be noted that Qtractor, like most other digital audio workstations, is not a waveform editor; for cosmetic corrections such as removing pops or blown-out plosives, or removing lip smacks or dampening roomtone, you should use a waveform editor such as Audacity.