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Higher-order simulation  techniques will be  a direct product  of the
research  with additive synthesis  in conjunction  with findings from
the frequency  modulation approach  described next.   A  higher-order
simulation  algorithm will  simultaneously  provide the  user with  a
powerful level of control over salient aspects of tone while reducing
and  making   more  experientially   relevant  the   type  of   input
specifications to the simulation  procedure. As we
come to understand the perceptually  important features of tone,  the
simulation algorithm will reflect this  understanding.  Features like
the relative  attack slopes and onset  times of components, expressed
in  simplified  graphical-relational  form,    such  as  the  overall
evolution  of the  bandwidth  of energy  distribution  of the  signal
through time,  will come to be directly dealt with by the user. Other
possible  important  features  of  tone,  e.g.    the  modulation  of
functions in amplitude or frequency or the existence of bandwidths of
noise,  will be controlled via meaningfully simple specifications  by
the user.
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