Any way to get my mac's volume keys working with my UR44?

I just recently bought a UR44 for use with a 2017 iMac running macOS 10.14.2.

I have discovered that the volume keys on my keyboard no longer work. Is there any way to get them working again with the UR44? I much prefer being able to control the volume that way then having to adjust the main output’s knob.

I have the latest driver, tools, and firmware installed.