Maya: limit scale

cedixon

I'm animating the scale of an object using MASH's Signal node. I'd like to limit the object's scale so it never drops below 1.0 - it should only grow bigger, not smaller. The 'Positive Scale' checkbox doesn't seem to apply since I'd like to never drop below 1.0 - not 0.0.

I'm fairly new to Maya, so if there's another way to limit/constrain a mesh's transform values in general - outside of the MASH system - I'd be interested to learn about it! I've tried searching but must not have the correct Maya terminology. I'm not really looking to build a complex rig for this! Any ideas?