Disable metronome altogether if you haven't tempo sync'd the song yet.
You may not need to tempo-sync it for your described use, but if you ever want to 'Generate' Realtracks to your song you'll need to do that.
To do this run it through the ACW (plenty of videos on that feature).

Then you'll have the tempo and chords so you can generate tracks, with a side benefit of having the metronome now line up with your song <grin>

But if all you want to do is record other audio tracks, you can turn off the metronome and select a blank audio track, click record and away you go.
There is also a 'Count - in' option in the metronome to disable the count-in so you don't get the annoying metronome pop up before recording if that is occurring.

Do a take, record over it until you have a 'maybe' keeper track.
Mute that tack and select another blank track and record .. eventually you may have enough tracks to cut/paste what you want to one final track, taking a piece from one and a different piece from another track. (Comping a track).
Or you can erase them and have more tries.

I do not work here, but the benefits are still awesome
Make your sound your own!