different flavors buildups.
2 macro's:
Attack: Controls the attack of the modulation.
Length: The length of the build up. This one is attached to Speed Curve. A hydra in the first fx track.
Speed Curve controls in turn: Duration, A LFO which adjust the duration of the buildup.
And VU Control. A LFO with a slightly longer envelope than Duration. This gives the buildup a nice tail.