Audio Wwise - Switch within a switch

I'm trying to set up a switch within a switch in Wwise and Unity. I'm able to set up the footstep switches that are based on the collision of the trigger boxes (for dirt, water and rock), but for the water I'd like to have different switches for that alone within the footstep switches so that depending on the character movement speed different water random containers will be triggered. Does anyone know how to do this?

 

I think the going further section of this blog post describes using an RTPC to switch between walking/running switches. Maybe you could try it for varying types of water movement?

https://blog.audiokinetic.com/-unity-3d/