Garage Band

Hi there, Vivian_D!

Thanks for reaching out to the Apple Support Communities! That's a great question you have about how to record without using the metronome o GarageBand. Check out this link to Record sound from a microphone or an electric instrument:

"Record live audio

1. Select the header of the audio or guitar/bass track you want to record to.
2. 
3. Move the playhead to the point in the ruler where you want to start recording.
4. GarageBand includes a metronome, which plays a steady beat to help you play in time while recording. You can turn this on or off using the Metronome button in the control bar.
5. Click the Count-in button in the control bar to have the metronome play a one- or two-bar count-in before recording starts.
6. Note: For the initial setup, choose Record > Count-in, then choose a measure.
7. Click the Record button in the control bar (or press R) to start recording.
8. Start singing or playing your instrument.
9. The recording appears as a new audio region on the track as you record.
10. 
11. Click the Stop button in the control bar (or press the Space bar) to stop recording."

If this is not the path you're needing to go, feel free to circle back with more information about your question.

Have a great day!

Greetings,

The way recordings are typically done in time to a metronome, without the metronome click being also recorded is by using headphones. The headphones isolate the sound of the metronome and any previously recorded tracks, allowing new tracks to be recorded in time with the previous and/or the metronome click.

You have to use headphones so the metronome does not "bleed" into the recording.