Randomly selecting a float track from timeline?

So i am trying to create a simple horizontal camera shake recoil, similar to H1Z1. I’m actually pretty close, however my issue lies with the two float tracks in which i created. The problem isn’t the tracks themselves, when hooked up separately, the both work as they should. What i would LIKE to accomplish, is for either of the tracks to be played at any given time, instead of just simply one or the other. Please help?