Added SynthControl.from_parameter() class method.
Added SynthControl.from_parameter() class method.

Pulgama/supriya,andrewyoung1991/supriya,Pulgama/supriya,Pulgama/supriya,Pulgama/supriya,andrewyoung1991/supriya,andrewyoung1991/supriya,josiah-wolf-oberholtzer/supriya