Terrible audio quality on an iMac in Express Scribe Posted July 3, 2017 · Report reply Have you tried adjusting the sound settings in Preferences? It's been a long time since I did it, but I vaguely recall having a similar problem. I tried a variety of adjustments until I got good quality sound again. Click on Express Scribe, then Preferences. You can adjust the volume level, volume auto-adjust, and clarity low frequency cutoff method. Currently I have these set at -8dB (level), and "none" for the other two. Good luck!