Digeridoos, Monks, Multiphonics, Chaos Theory

[Sean Costello]

Hi all:

(Note:  the following is not about x0x boxes, the bastard quotient of anyone
whose initials are DM, the price of a given synth, etc.  I think it is
analog, but I am not quite sure, as it seems to involve processes that don't
conform to normal physics. I'm just hoping some of you smarties out there
might have some good ideas.)

I managed to get a good digeridoo sound with my voice last night.  I worked
with adding a gravelly buzz (of very low frequency, more like a series of
clicks or pops) in my throat to a humming sound, and trying to maintain the
two together.  At some point, the buzz "locked on" to the frequency of my
humming, producing a buzzy sound an octave below the note I was originally
humming. I was trying to emulate the Gyuto monks, but by messing around with
the shape of my mouth and position of my tongue, I could come up with a good
digeridoo sound.  I need to figure out how to get more volume with this
sound, and to get more consistent with it.  The "period-doubling" seems to
lock in, but I can't maintain it. I'm not sure if the Gyuto monks get this
sound in the manner I am doing so, or if they just shred their vocal chords
(glottal fry) in order to make their larynx go into weird oscillation modes.
Multiphonics are fun.  

Synthesis tips, anyone?  My guess is that some chaotic signal in the voice
is locking on to some period of the larynx's vibration.  Kind of like
oscillator sync, except that the noisy signal is locking on to a subharmonic
of the main signal, as opposed to a harmonic.  I think one of the sync modes
on my Octave Cat can do this, but it doesn't sound like a monk at all.
Would a Serge DSG, used as a pitch divider, be able to simulate this?  Has
anyone worked with any circuits designed to emulate the specific
nonlinearities in the human voice (glottal fry, the above monk stuff, etc.)?
What the hell sort of physics is going on here?  And why does it sound so
amazing? Time to bone up on my math - chaos theory seems pretty tough...

Also, one time I was playing guitar with an E-bow, and the battery started
to give out on the E-bow.  Now, an E-bow normally makes a string ring either
at the fundamental frequency, or at a harmonic of the fundamental.  For some
reason, the E-bow started to make my string ring at SUBHARMONICS of the
fundamental frequency. An open string would start ringing an OCTAVE below
its tuning, or an octave and a fifth below. What the hell was going on?

If anyone has any ideas of what I am talking about, please let me know.
Technical answers would be greatly appreciated.

Sean Costello