xpVortex General tab menu.
Checking this box activates xpVortex.
Set at Independent, by default.
You can change this to Action-Controlled.
In this mode, particles will be affected if they come into the field of effect of the modifier.
When in the Action-Controlled Mode setting, the modifier will only act on a particle when told to do so by an action.
Set as Velocity, by default.
The alternatives are Force and Helix.