Opcode:
ares distort1 asig, kpregain, kpostgain, kshape1, kshape2[, imode]

Equation:
       exp(asig * (shape1 + pregain)) - exp(asig * (shape2 - pregain))
   aout = ---------------------------------------------------------------
          exp(asig * pregain)            + exp(-asig * pregain)


where is "postgain" supposed to be?

-Chuckk

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