In the Kronos, effect number 016 in the effects list is labeled 'Stereo Wah/Auto Wah' (page 920 in the parameter guide). That's the one you want. Set the sweep mode to 'Auto' and adjust the various parameters to your liking paying particular attention to Resonance, Envelope Sensitivity and Envelope Shape.
Hope this helps,
Dave
P.S. Still sounds like a Wurlitzer to me.
P.S.S. Oberheim Four-Voice in that picture. And it could be a Wurlitzer underneath.