Zoom H8 Operation Manual page 73

5.
Tap Execute.
Recording additional files
When Punching In/Out is Off, new files are always recorded.
When Punching In/Out is On parts of already recorded tracks can be partially re-recorded.
1.
Tap .
2.
Tap Punching In/Out.
3.
Set it to Off or On.
Setting
Off
On
Explanation
Always record new files.
Parts of already recorded tracks are rerecorded.
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