e bow or sustainer preset...?

I don't think this is possible... eternal sustain (non feedback) has to come from an external source that generates string vibration...like the ebow, sustainer pickup or vibesware gr-1 (basically an ebow on a stand)
 
you can simulate this with delay hold and compression, but as @Gonwild posted eternal sustain has to come from the strings vibrating.
 
I agree, not possible without an external device. I recommend the Sustainiac from Maniac Music... I have them fitted in my EBMM JP6 and my Ibanez Jem7BR and they are awesome... I use In Ear Monitors live so things can 'feel' a bit sterile without an amp/speaker pushing back at you so the vibrations of the Sustainiac is great for making things feel a bit more organic.
 
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