I'm trying to figure out how to best emulate that feedbacking sound Summers gets at the beginning of Synchronicity 2. It sounds more synth like than your standard feedback. Any ideas how to best get that sound?

Sounds like Andy's got his tele feeding back into a delay and is tweaking the delay time to get that quick synthy dipping sound.

I recently had to perform this song and I mimicked the effect by using a Z Vex Fuzz Probe switching on to get the tape start effect that starts the song, and then let the guitar howl and feedback with lots of reverb on it.

Roger