M4L Device not working properly until adjusting parameters

Alright, this is an odd one and probably involves something simple I'm missing, but... I've been working on some devices, and I've noticed that certain dials (With ☒ Initial Enable and a preset value defined) don't seem to send their value until I adjust them. Is there something I'm missing? I have a similar issue with a umenu that selects an audio source, but until I click it, there's no audio. What am I forgetting to do here?