Changing Effect Playback Rate

Is it possible to change the rate of a programmed effect from a playback Choose button? The Hog II allowed this but the III appears not to. If not it would be a helpful feature to have. I have been using the III for a festival recently with visiting LD's and programmed a few busk pages but the apparent inabilty to change the rate of effects live meant that I had to record different speed versions of the same cue.
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