typedef struct _ModulePeriodicFunctionGen
{
    ModuleInstanceDescriptor instance;            // Common Audio Weaver module instance structure
    INT32 functionType;                           // Type of the wave form to be generated on output
    FLOAT32 freq;                                 // Frequency of the function generator output wave.
    FLOAT32 amplitude;                            // Amplitude in linear units.
    FLOAT32 offset;                               // Starting phase of the function generator output wave.
    FLOAT32 offsetRad;                            // Offset in radiuns.
    FLOAT32 phase;                                // Instantanteous phase and also starting phase.
    FLOAT32 phaseInc;                             // Instantaneous sample to sample phase increment.
    INT32 impPeriod;                              // Period or rate of the impulse generator.
    INT32 impSampleIndex;                         // Specifies the index of the next non-zero value.
    FLOAT32 triPhase;                             // Instantanteous phase and also starting phase.
    FLOAT32 triPhaseInc;                          // Instantaneous sample to sample phase increment.
    FLOAT32 sawPhase;                             // The stored phase of the sawtooth function.
    FLOAT32 sawPhaseIncrement;                    // The amount that the oscillator phase is incremented for each output sample.
} ModulePeriodicFunctionGenClass;