What does the negative feedback parameter of the delay effect do?
Negative feedback using short delay times will produce an out of phase repeat that flips in and out of phase with each repeat, this is good for creating different textured sounds when using delay for slapback and doubling type effects. You could also modulate the delay time within a range from 2 to 20 or 30 milliseconds to create flanging or chorus and the negative feedback is inverted and gives a different type of sound to the flanging or chorusing effect. I hope this makes sence, you would have to experiment to find out what the difference in sound is, but it makes for some interesting and different sounds to play around with.
