Input Mute from Mix. Using the front panel shortcut HP press + Input PFL an input can be removed from the Master Output bus. The input still appears at its direct output and if selected as an option for AES output.
Input PFL now indicated with a flashing yellow input LED. Original indication was solid yellow.
In the absence of a time code signal, timecode & speed related metadata is not written. This is to prevent Final Cut Pro from introducing unintended sound file speed changes. The 552 continues to write the time-of-day value as a start time code stamp in bEXT when when time code is absent.