IK UNO Synth Pro User Manual page 18

UNO Synth Pro
is from 0 to 127.
RELEASE: Sets the amount of time for the sustain level to 0. The range is 0.1ms to 30 sec.
Other parameters are accessible from the EDIT PRESET menu.
LOOP: Both envelopes have the ability to loop. When the control is set to ON, it goes back to the attack stage
after the end of the decay stage, and repeats the envelope cycle until stopped.
RETRIGGER: Retrigger of both the envelopes is automatically switched when using the VOICE button to switch
between MONO, LEGATO and PARAPHONIC mode.
However, you can individually select the ON/OFF status of the retrigger based on the necessity.
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4 – Front Panel Interface