xpSpriteControl Object tab menu.
Checking this box activates xpSpriteControl.
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.
Enabled by default; if this is disabled, the xpSprite object will not generate an object for the particle.
This image shows the xpSprite generator generating Pyramid sprites. xpSpriteControl is disabled here.
In this second image, xpSpriteControl is enabled, so when the particle sprites enter the xpSpriteControl field, they are no longer generated.