Roland E-4 Owner's Manual page 22

Using the Looper
Playing back recorded audio
1. Record once, and then stop recording.
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Recording audio input
2. Press the [â/ó] (play/record) button when recording has stopped.
Playback begins when you press the button. SYNC OUT clock returns to the beginning (when set to do so).
During playback, the [â/ó] (play/record) button lights up and "PLAY" is displayed.
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