On-The-Fly Recording On-the-fly recording is useful if you are recording someone else and only wantto record a small portion of their performance. To record on-the-fly: In the Transport window, click the Record button while Play is already engaged (pressing Option-R does not work for on-the-fly recording). Metro immediately switches to record mode and begins recording from that pointin the track and onwards. Click Stop or press the Spacebar to stop recording.