Re: About Multiphonics....
Well, it's like a lot of effects on the sax, a little can go a long way. I can't remember the tune off the top, but Coltrane used some multiphonics in the melody of a tune that was pretty interesting because the split tones fit the harmony of the tune (I think it's on Coltrane Plays the Blues if memory serves...which it does less and less these days). Brecker likes to split his altissimo G almost every time and he does some nice things with multiphonics (Check out Chick Corea's Four Quartets...the one dedicated to Coltrane...I've probably listened to that solo several hundred times since it came out). Lovano likes to split a lot of his altissimo notes, probably to fatten them up a little.
It is possible to play multiphonics in a musical way. They don't always have to be so outside. There is an excellent book I purchased some years ago on multiphonics by a guy in Portland, Oregon (John Gross perhaps?). It's very comprehensive. If anyone is interested, I can get info on it.
For my taste, multiphonics can be a nice spice for intensity in a solo, but can be pretty hard to take as a main course (ala Pharoah Sanders when he played with Coltrane...did he ever just play a straight line? Maybe Coltrane said, that's for me, you stay out in the stratosphere brother).