Feedback issue

Microphony, that is what we call it...Well, I have this question "bout it.What exactly makes the guitar squeal?I have noticed this.It never squeals on a clean sound.Always on drive.Unless I am using my wolume pedal as a wah, then it squeals on clean also.Sometimes.It squeals only on certain type of drives.And when using a certain pup configuration.For example; I have an S and a RG Ibanez.S has a ssh configuration, RG hsh.When I plug an S, it never squeal when the pup switch is in second or fifth position.With RG, this is not the case.Soooooo...What does affects the feedback?Is it a certain type of effect?Say, for instance, reverb?Or does it have to do only with pups?
I am thinking LATS would know all bout this stuff... ;)

In very generic terms, feedback occurs when the sounds comming out of your amp set up a sympathetic vibration with the strings of your guitar. The creates a loop and in effect builds and builds. There are many things which effect feedback. Volume of the amp, Positioning, direction of the pickups relative to the amp, tone settings. There are others, but that's a good start.

Oh, I know all about that.I was just wondering if a certain type of effect causes feedback.Know what I mean?Like, say, chorus, or reverb.Or something-something.

I'd say that they can contribute, but not actually cause it.