What is com.apple.audio.SandboxHelper
For what it's worth, I've been looking at an audio issue today and noticed I had 6 different instances of com.apple.audio.SandboxHelper running. Checking showed that the system thinks it has 6 different audio devices attached, so it seems each audio device get a SandboxHelper to look after it.

Oddly, no other piece of hardware, or associated drivers, has a SandboxHelper associated with it, so either the audio devices are the only ones that need help operating in a Sandbox, or only the audio driver team used that name and other tasks running in Sandboxes have their helpers called something else.