Drawable Pitch enveloppe on audio file as in cubase sx3 & ableton live ????

Hello

In cubase sx and live , you can find pitch enveloppe ( or transpose ) .
Live makes it real time with possibility to draw a pitch curve , SX makes it off line on an audio file.

I am looking for the same kind of tool in Logic . Does it exist ????

So far , the only way i could reproduce this effect ( i like to play long delay with endless feedback and automate the pitch of the feedback , or make a 1 osc riser sound with flat osc sound that i pitch afterwards ) was to insert apple's plugins : Pitchshifter II or apple AUpitch and automate them .
The problem is realtime automation of these plugins cause clips and glitch , and the pitch is going up step by step and not in a linear way . ( you can hear every semitones variated , no transition between tones ) .

So is there a drawable pitch enveloppe option in Logic 8 ?
If yes , where would that be ??
Otherwise is there a better alternative to pitchshifter II & AUpitch ???

I ve been serching in the manual already + i am aware that the Delay Designer fx can do the same work , but it s only working with delayed sounds.

I hope it was clear enough.
Thx in advance.