SinOscFB is a sine oscillator that has phase modulation feedback; its output plugs back into the phase input. Basically this allows a modulation between a sine wave and a sawtooth like wave. Overmodulation causes chaotic oscillation. It may be useful if you want to simulate feedback FM synths.
The base frequency of the sine oscillator in Hertz.
The second argument is the amplitude of phase feedback in radians.
Output will be multiplied by this value.
This value will be added to the output after any multiplication.