Electro-Harmonix 2880 User's Reference Manual page 19

Overdubbing:
Begin Overdubbing by pressing the RECORD button. Immediately you will see both the RECORD and PLAY LEDs
light up.
If the loop is playing back, pressing the RECORD button will put you into Overdub mode while in the middle of the
loop cycle.
Again you will be Overdubbing on the track that is currently active; the track(s) with its LED lit up.
Moving the active track's fader to anything below 100% will attenuate the previously recorded audio on that track
each time the loop cycles. The track fader will act like a Feedback control on a delay effect. If you do not want to
attenuate or lose the audio already on the track, make sure the fader is set to 100%.
While Overdubbing you can move the TEMPO Slider to achieve slowed down or sped up sounding instruments. You
can also press the OCTAVE button, which will automatically drop the pitch and tempo of the loop exactly 1 octave.
The TEMPO slider changes the speed of the loop in semitone (1/2) step increments.
You can press the REVERSE button at anytime to reverse the playback direction of the loop. By doing this you can
easily record a backwards guitar line.
When using the OCTAVE and REVERSE buttons, activating either function will act on all 5 tracks of the loop, not just
the active track.
The TEMPO LED lights up when the TEMPO Slider is set to the same tempo that the original loop was recorded at. If
you move the TEMPO Slider you will see the TEMPO LED light up only when the TEMPO Slider is set to its original
setting. This is an easy way to get back to the original pitch and tempo of the loop.
Punch-In:
If the Punch-In function is activated while Overdubbing, whatever was recorded previously on the active track will
be erased.
Punch-In is useful for situations where you want to fix a bad note or simply erase one section of the loop.
While playing back you can push the active track's fader up so that you can properly hear the track. Once you press
RECORD, the track will go silent. It is erasing and recording as the loop plays.
Steps for a common Punch-In:
1. Select the track you want to Punch-In.
2. Press the Punch-In button so that it is active.
3. Press the Play button to playback the loop.
4. When the punch-in section arrives, press the RECORD button.
The 2880 immediately begins erasing and recording onto the active track.
5. When the Punch-In section is finished, press RECORD or PLAY to stop recording.
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