Differences between motion tweens and classic tweens

Flash Pro supports two different types of tweens for creating motion. Motion tweens, introduced in Flash CS4 Professional, are powerful and simple to create. Motion tweens allow the greatest control over tweened animation. Classic tweens, which include all tweens created in earlier versions of Flash Pro, are more complex to create. While motion tweens offer much more control of a tween, classic tweens provide certain specific capabilities that some users need.
The differences between motion tweens and classic tweens include the following:

• Classic tweens use keyframes. Keyframes are frames in which a new instance of an object appears. Motion tweens can only have one object instance associated with them and use property keyframes instead of keyframes.
• A motion tween consists of one target object over the entire tween span. Classic tween allows tweening between two keyframes, containing instances of the same or different symbols.
• Both motion tweens and classic tweens allow only specific types of objects to be tweened. When you apply a motion tween to non-allowed object types, Flash offers to convert them to a movie clip when the tween is created. Applying a classic tween converts them to graphic symbols.
• Motion tweens consider text a tweenable type and do not convert text objects to movie clips. Classic tweens convert text objects to graphic symbols.
• No frame scripts are allowed on a motion tween span. Classic tweens allow frame scripts.
• Any object scripts on a tween target cannot change over the course of the motion tween span.
• Motion tween spans can be stretched and resized in the Timeline and are treated as a single object. Classic tweens consist of groups of individually selectable frames in the Timeline.
• To select individual frames in a motion tween span, Ctrl-click (Windows) or Command-click (Macintosh) the frames.
• With classic tweens, eases can be applied to the groups of frames between the keyframes within the tween. With motion tweens, eases apply across the entire length of a motion tween span. Easing only specific frames of a motion tween requires the creation of a custom ease curve.
• You can use classic tweens to animate between two different color effects, such as tint and alpha transparency. Motion tweens can apply one color effect per tween.
• Only motion tweens can be used to animate 3D objects. You cannot animate a 3D object using a classic tween.
• Only motion tweens can be saved as Motion Presets.
• With motion tweens, you cannot swap symbols or set the frame number of a graphic symbol to display in a property keyframe. Animations that include these techniques require classic tweens.
• There can be more than one classic or motion tween on the same layer, but there can't be both types of tween on the same layer.