Grass Valley NewsEdit XT v.5.5 - Manual (Page 193)

Adding Audio Narration
Digital News Production 191
7. To start recording, press F12 on your keyboard or click the Start Recording
button.
8. To stop recording, press the spacebar on your keyboard or click the Stop
Recording button.
If you’ve enabled Loop Tones (see the Table on page 312 for instructions), a
tone will sound at the end of each microphone recording. When the loop tones
are done playing, the record starts again automatically. You can use loop tones
for voiceovers directly to the Timeline in case you make a mistake and need to
re-record.