How do I get feedback from the guitar/amp? I want to be able to control it for example the solo in "let her cry" by Hootie & the blowfish in the third solo when he plays the first half of the solo while the guy is singing he gets some feedback and then repeats the lick.
turn up the volume, and get close to your amp. Hit a string, and it should ring into feedback.
you've gotta have your amp volume quite high, and have a nice dosage of gain too.
plus, the type of feedback you'll get, it varies depending on where the guitar is facing, comparing to the amp.