IK UNO Synth Pro User Manual page 31

UNO Synth Pro
Holding the arpeggio
You can hold the arpeggio notes by pressing HOLD. The button will light up when engaged.
Recording the arpeggio into the sequencer
To record the arpeggio into the sequencer, while holding the notes for the arpeggio with the arpeggiator
engaged, press REC+PLAY: the sequencer button will blink and it will record the arpeggio in 16 steps. Once the
16th step is recorded, the arpeggiator will disengage and the sequencer will playback what has been recorded.
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5 – Global Controls