ufoProcessSetEffectTy pe

    void ufoProcessSetEffectType(
       ufoProcess process_instance,
       ufoEffectType effect_type);

This function may be called to set type of the effect group that the UFO belongs to. Currently the only setting other than the default, ufoUndefinedEffect, is ufoTransitionEffect. This may be set in order to inform the application that a UFO is a transition effect.

Within the application’s Composition Editor, only transition effects may be used for performing transitions between track segments.

If you want parameter keyframes to automatically scale in duration during certain invocations in the application then you should use ufoProcessSetParamAutoTransition passing the specific parameter index.

By default the process effect type is ufoUndefinedEffect.

Autodesk Softimage v7.5