Final answer:
The multitrack recorder must be in input, record, or arming mode to receive signals, which involves arming tracks and setting appropriate levels before recording.
Step-by-step explanation:
The multitrack recorder must be in a specific mode to receive the signal. This mode is commonly referred to as the input, record, or arming mode. In this state, the recorder is ready to capture audio from various external sources. To record, each track that you wish to use must be armed - this tells the recorder that you intend to capture audio on that particular track. It's important to set the correct levels and ensure that the source is properly connected to the multitrack recorder. Once the tracks are armed and levels set appropriately, when you hit the record button, the recorder will capture the incoming audio signals onto the designated tracks.