This is not a tip for everyone.
You may be aware that Apple added some editing capabilities to Quick Look. For instance, Markup is available to edit text and image documents and Trim is available to edit video and audio files.
The scrub/trim area becomes available after clicking the Trim button which initially appears in the upper-right corner of the window.
If this suggests to the suggestible reader that this makes a handy audio editor, think twice: editing this way is not very precise and accepted changes are permanent. But, for trimming large audio files of "dead air" or crowd noise or what have you, some may find it convenient.