How to add feedback to a patch?

At one point I saw a post on how to add feedback to a patch. I can't seem to find it now, any suggestions on how to do this?
Thanks
 
Set the Compressor Type in the Amp block to Gain Enhancer. It's supposed to mimic acoustic feedback between the guitar and cab. Short of that, lots of volume and stand close to the speakers.
 
Feedback?

Lots of gain haha. Does the trick for me at least (stacked pedals into a somewhat dirty amp).
 
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