Wow. Interesting idea. It's a pity I can't download the file now, but I will this evening
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Some thoughts off the top of my head:
- Are you sure that you can't use Vibrate for this purpose? Have you tried maxing out frequency and amplitude?
But anyway, slight is the hope for it to work for this effect... I wish we had bone arc mode in BoneVibrate...
- Try using several stacked BoneVibrate ops.
- Try to use BoneVibrate together with rotation. But before that,adjust the pivot of the wing.
- If you are going for a grotesque effect, you can use Multiply with limited rotation anim or even particles with animated Wobble.
- Pre-animate the mesh in XSI? But that is cheating, imho
Edit: Use global varibles for symmetry.