Power:

   LOG(expr)..........log base 10
   LN(expr)...........log base e
   EXP(expr)..........exponential function e^expr
   POW(expr1,expr2)...expr1 raised to expr2 power
   SQR(expr)..........square
   SQRT(expr).........square root

Trigonometric:

   SIN(expr)..........Opus uses radians for all angles
   COS(expr)
   TAN(expr)
   ASIN(expr)
   ACOS(expr)
   ATAN(expr)
   ATAN2(x,y).........4 quadrant arctangent
   RAD(expr)..........converts degrees to radians
   DEG(expr)..........converts radians to degrees
   PI()

Hyperbolic:

    SINH(expr)
    COSH(expr)
    TANH(expr)
   ASINH(expr)
   ACOSH(expr)
   ATANH(expr)
