Plethora X5 - How to keep echo decaying off after you turn the effect off



On the Plethora X5, I would like to kick off the echo while having it finish the last decaying echoes versus just a hard stop of sound.  Is this possible via the Toneprint app?  I have tried to find where I would allow echos to ring after turning off effect but can't find anything. Any assistance is greatly appreciated.  Thank you!