handle full signed effect magnitude range

+ Direction scaling can produce 32768 for the valid input pair -32768 and a
  negative full-scale sine value. Storing the intermediate result in s16
  wraps it before constant, ramp or periodic effects are converted.

+ Keep direction-scaled values in s32 until their destination range is
  known. Periodic effects cannot represent a magnitude above S16_MAX, so
  clamp the asymmetric endpoint after making the magnitude positive. This
  also prevents the following headroom calculation from using a negative
  wrapped magnitude.

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