a good start for formant like sounds is to use the Grain or Formant Oscillators and modulate the Wavetable Index, F-Shift and F-Spread parameters, in addition to working with LP filter and resonance modulation and the more aggressive distortion types. Combining that with the phaser or and filter bank can get you some wild result.
Vember, try the F-Shift param in the Complex Grain mode with a square wave such as can be found at the beginning of wavetable Sqr Series. Osc sync sweep functions can take you into this territory, too.
Wavetables heavy on formant pitch sweeps are:
I love formant synthesis which is what started my interest in synths to begin with!
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