Same for me. I get sound from my mic thru my audio interface, but nothing in Studio One v5.5. The proper inputs are selected from the input track. The track is armed for recording, input monitoring is enabled, and still no sound or levels. Just an empty event when I press record. I've tried using my Audient iD14, and Scarlett Solo running my AT4833 microphone through a Pro MPA II preamp.
I've also tried removing/adding new inputs, toggling between different sound devices, and restarting my computer.
The only thing that worked was using a different DAW (Reason 11.3) to record. smh