Having trouble using Arturia Fragments for an effect

[ghostwhistler]

(I assume you are familiar with the plug in, it's a granular effects thing).

I want to create an effect at a certain point in the song. I want it to start at that point and then end a few bars later. The effect features the grain size reducing in size over that part to create a motion effect.

My issue is having the effect stay silent and only starting at that point, not endlessly cycling. I can automate volumes and sends to keep the effect in the background until needed. But what I can't do is have it only trigger at that point. It will just keep cycling in the background and I can't see any way to have it start the effect at the desired point.

Assuming that makes sense (I can't explain it any better), can anyone help? The effect, and thus motion, is always active. I can't see an option to trigger it via automation.

Thanks

[swilow11]

I would render as audio the bit I want effected and then apply Fragments to that alone.