How to test custom virtual audio device with shorter feedback loop?

Question

I'm trying to create what's essentially a Krisp clone that creates a virtual audio device that will process my audio input using RNNoise. As a starting point, I'm using this example from the CoreAudio documentation: Creating an Audio Server Driver Plug-in. The first milestone I'm trying to achieve is to simply create an "echo" virtual audio input device that will mirror the input of a real input device such as a microphone with no processing.

What I've found so far is that testing is very cumbersome - I have to install the built plugin to /Library/Audio/Plug-Ins/HAL and then reboot my Mac. Is there a way to get a shorter feedback loop that does not involve rebooting?

Disclaimer: I have 0 experience with both macOS and audio programming. I also have almost no experience with C. If there's already an app that implements what I'm trying to achieve for free, I would be more than happy to use it instead of building my own.

Answer 1

sudo launchctl kickstart -k system/com.apple.audio.coreaudiod does exactly what I want.