The [Reset] Button; Record Or Play From A Specified Measure - Yamaha Portatone PSR-410 Owner's Manual

You can start SONG MEMORY recording or playback from any specified measure, as long as the specified
measure is within the range of measures that has already been recorded:
Z
X
C
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Press the SONG [RESET] button to go directly to the first measure of
the song and turn ON all tracks that contain data. Measure number "001"
will appear on the MULTI DISPLAY. The [RESET] button also functions
during playback or recording.
If the measure number is not currently shown on the MULTI DISPLAY,
press the [MEASURE #] button. If the measure number is already showing,
go directly to step X.
Use the [+] and [–] buttons, the number buttons, or the [MEASURE #]
button itself to enter the desired measure number.
Start playback or recording. You can now start playback or recording
from the specified measure number.
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