Crackling audio playback - multiple formats and volume level

For completeness, no-one suggested resetting preferences. It seems to have worked for one user in another topic Deleting the preferences file for audacity on the mac . I wouldn’t expect it to work in your case given you have already checked sample rates and formats.

However for anyone who wants to reset preferences on Mac:

  1. Audacity > Quit Audacity.
  2. Open Finder, Go > Go to Folder and type:
~/Library/Application Support/audacity/
  1. Open audacity.cfg in Textedit or other text editor.
  2. Select all the content of audacity.cfg then delete that content.
  3. Select and copy the following text, then paste it at the top of audacity.cfg:
NewPrefsInitialized=1
  1. Save audacity.cfg and start Audacity.

Gale