Copyright (C) 2006  Nathan (Acorn) Pooley

This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License
version 2 as published by the Free Software Foundation.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License (gpl.txt) for more details. 

You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.

You can contact the author, Nathan (Acorn) Pooley, by writing
to Nathan (Acorn) Pooley, 949 Buckeye Drive, Sunnyvale, CA  94086, USA
or through the form at http://www.rawbw.com/~acorn/wand/feedback.html




Accelerometer values

delta   val     what
-----   ---     ----
        4f      -1g
6
        55       0g
7
        5C      +1g


LEFT & RIGHT
------------
accelerate left  = -
accelerate right = +

delta   val     what
-----   ---     ----
        10      hard tap right
15
        1f      hard wave
32
        3f      light tap right
8
        47      light wave
14
        55      0g
14
        63      light wave
13
        70      light tap left
16
        80      hard wave


UP & DOWN
---------
accelerate up   = -
accelerate down = +

delta   val     what
-----   ---     ----



CARRY

a + (-b)
a - b    carry set if a>=b
         carry clr if aB


TEMPO/RYTHM
-----------
impulse threshholds
    > 0x200 for change of dir
    > 0x100 for start/stop

max mag threshold
    > 0x20 for tap   (ignore nearby samples in similar direction)