In LIVE MODE you can scroll back and zoom into portions of the
scrolling spectrogram. After scrolling back in time, a “Return to
real-time” button appears at the top right of the screen; press to
jump forward to real-time. You can scroll back in time through up
to 10 minutes of history. The app will intelligently reduce the
history if the iOS device is nearly full. A frequency reference line
allows viewing a specific frequency.