AlphaSynth.Bank.Patch.Sf2Patch.CalculateModulator C# (CSharp) Method

        private static double CalculateModulator(SourceTypeEnum s, TransformEnum t, DirectionEnum d, PolarityEnum p, int value, int min, int max)
        {
            double output = 0;
            int i;
            value = value - min;
            max = max - min;
            if (d == DirectionEnum.MaxToMin)
                value = max - value;
            switch (s)
            {
                case SourceTypeEnum.Linear:
                    output = value / max;
                    break;
                case SourceTypeEnum.Concave:
                    i = 127 - value;
                    output = -(20.0 / 96.0) * Math.Log10((i * i) / (double)(max * max));
                    break;
                case SourceTypeEnum.Convex:
                    i = value;
                    output = 1 + (20.0 / 96.0) * Math.Log10((i * i) / (double)(max * max));
                    break;
                case SourceTypeEnum.Switch:
                    if (value <= (max / 2))
                        output = 0;
                    else
                        output = 1;
                    break;
            }
            if (p == PolarityEnum.Bipolar)
                output = (output * 2) - 1;
            if (t == TransformEnum.AbsoluteValue)
                output = Math.Abs(output);
            return output;
        }