Never used a circle, but remember you don't have to. You can create a line model set to the same channels as the circle and you shouldn't have any problem doing what you mentioned.
James
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Well that's the thing though, even with a single line model representing the circle, it does the same thing.
And even if you just use a single line model by itself, the effect goes to the end of the line, waits till the whole effect has gone to the end, then resets.
James (MrRocketman)