Distorts the input depending on a transfer function you draw by dragging
the control points with your mouse. Can be used as a distortion unit,
soft clipper, waveform modifier, or control voltage transfer function (e.g.
custom velocity response curve).
NOTE: If the center node is not exactly in the center of the grid, an input of
zero (silence) will tranform into a DC-Offset (non-zero constant output).
This may cause audible clicks in your signal.