Updating my earlier post of stutters and crackles: Unintalled 2.82 (see below), and re-installing 2.82 produced that same problem. Uninstalling 2.82 then installing 2.75 (and restarting) got my audio problems gone and back in business with my beloved fireface 800:):):):):):)
Thanks very much for years of reliable performance on the best audio interface there is, and for looking into things so quickly!
Uninstall Fireface driver instructions(for Apple).
Send the following files to Trash, restart, empty Trash, then install the driver.
/Applications/Fireface Mixer
/Applications/Fireface Settings
/Library/Audio/MIDI Drivers/Fireface MIDI.plugin
/System/Library/Extensions/FirefaceAudioDriver.kext
/Users/username/Library/Preferences/Fireface folder
/Users/username/Library/Preferences/com.rme.FirefaceMixer.plist
/Users/username/Library/Preferences/com.rme.FirefaceSettings.plist
When using the new Snow Leopard driver also delete:
/Library/LaunchAgents/de.rme-audio.firefaceAgent.plist