To further complicate this, slightly....
Modulating the PW, or Metallizer parameters with, say, a LFO Sine or Triangle, is effectively turning the PW and Metallizer knobs automatically. But the Ultra behaves differently. Turning up the Ultra knob increases the volume of the extra Sawtooth Wave(s) that create that sound, but modulating the Ultra parameter seems to alter the phase of those extra Sawtooth waves, rather than changing the level of them, like the Knob does. If you modulate the Ultra parameter, while Ultra knob is turned all the way down, nothing happens.