motu ultralite MK3 w/audacity

I have an interface by Motu, the Ultralite MK3; it’s the earlier version with only the firewire option. I have the apple firewire/thunderbolt adapter, and I’m running os 10.14 (Mojave). I have downloaded the motu software. My Audacity 2.3.3 recognizes the motu as an input, but I can’t seem to get levels on the meter, though I have levels on the motu itself. Any suggestions! thanks, kevin in NM