This kind of unison bend is used in conjunction with the A formation barre chords. Barring the bottom 4 strings in the 12th fret is a G chord, but you only play the 4th, 3rd, and 2nd strings, and block the 1st string. They sound great with distortion, or playing clean, and I use them with other effects too.
The dissonance Hunter1801 mentioned, can be achieved by letting the bend slip a little, and you'll hear the vibrations get further apart as you drop the pitch on the bent string. After that push the bend back up to pitch, and let it drop again. I would practice this with a clean tone so you know how it sounds, before adding distortion though. I hope this helped you a little, and let us know if you have any other questions.
I hear muted raking, and I've heard it called sweeping too in the first solo of Heaven. The strings are muted in a downstroke, and when you get to the 2nd string you bend it. The same technique is used for a bend on the 1st string too. I would practice just the bend first, and then mute the strings when raking, and do the bend. It's almost a slap on the strings leading up to those bends, and that's basically the signature of that first solo. Well that's my 4 cents, and be sure to let us know how it goes.
You do know that "Heaven" is in our song section, and Anders covers the solos.
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JD
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Latest Tutorials
Bending The Flat 7 To The 1
Chicken Pickin'
Hybrid Picking Exercises: One Finger
Hybrid Picking Progression In A
Double Stop Progression In A
Crosspicking Combinations
Behind The Nut Bends On The G String
Behind The Nut Bends On The B String
My Lessons
http://www.youtube.com/jdfenderbender
myspace.com/jdjarrell
myspace.com/guitartrickscountry
twitter.com/jdfenderbender
facebook.com/jdjarrell