Hi Jonmeldrum,
In UE3/UDK we have a setup of a leaf particle that is falling. A lot of the information from the Cascade should be able to be replicated in UE4. It may take a bit of time on your part to replicate it but it’s certainly doable. (Falling_Leaf is the name of the particle system included with the starter content in UDK)
In this there are three particles being created and used. This may be helpful for your example you’re looking to create.
Thank you!
Tim