Q: How do you record the Metronome?
A: The metronome is a reference tool to assist you in time keeping and
there's no way to record it in MIDI recordings. You can however draw it
in yourself in the Piano roll or if you Mixdown your MIDI & Audio tracks
Q: I wonder how to get rid of the metronome from click when I burn my
song to a cd.
A: When mixing down your audio or recording your MIDI as audio, you need
to turn off the metronome. Click on Options > Metronome Settings.