Samick DCP-12 Manual page 36

Play a Previously Recorded Track While Recording a Second Track
Press the [TRACK] button of the previously recorded track you wish to hear,
so that its blue LED is lit.(If the Track button for the track you wish to hear is
already lit, you can skip this step and proceed to Step 2).
Simultaneously press the [RECORD] button and the [TRACK] button of the
track you wish to record on. This will start the Metronome.
Start playing the keyboard. Recording starts as soon as you play the first note
(as does playback of the previously recorded track).
NOTE
When Record Wait Mode is active, you can also start recording by pressing the
Play button. In that case, the Song Recorder will record silence until you start
playing the keyboard.
TRACK 1
RECORD TRACK 1
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