Yamaha AW2400 Manual page 17

The selected input channel will now be connected to the selected track. Both the
selected [INPUT SEL] key and the selected [TRACK SEL] key will be blinking red and
there will be a line connecting the two on the screen.
6. Raise the fader of the track that you are recording on to the 0 mark.
7. To begin recording, simultaneously press the [PLAY] and [REC] keys in
the transport section. The lights above the [PLAY] and [REC] keys will
light up, and the AW2400 will begin recording the next track.
Continue this procedure until you have all of the tracks recorded. After
you have recorded all of the tracks now proceed to the next step, which is
mixdown.
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