Zoom RhythmTrak 234 Operation Manual page 29

To erase the sound from a specific pad, push the pad while holding the
10
STEP
[DELETE/ERASE] key down.
While the key is held down, the sound from that pad is erased from
the pattern. To erase the entire bass track, push the [BASS] key of
the [KIT/TRACK SELECT] keys while holding the [DELETE/ERASE]
key down. While both keys are held down, the bass track is erased.
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When recording is completed, press the [STOP] key.
STEP
26
B2 pad
[DELETE/ERASE]
[DELETE/ERASE]
[DELETE/ERASE]
[BASS]