Hello,
The only VMIX support is VB.NET right? And it has an API for making it controllable externally. So, for your project is easy to set the position using the API, once the Audio Meter API returns the preferred level. And for the detected sequence, you could simply set the PTZ Zoom value on center of all positions.
That's all, already described on API and easy to code in VB.NET.
Let me know your result.
Best Regards,
Khamid