I know you fixed the issue with having multiple copies open, but I actually have been using this 'bug' as a feature with my students in voice coaching, to allow a running comparison of different microphones (ie my own and Zoom) - Is there a way you could re-implement this intentionally? Maybe open a second instance via the Audio Input panel?
I apologize that the change caused an inconvenience. I appreciate you letting me know. Hit me up at support@minimeters.app and I can get you an older version to hold on to for the meantime if you need it.
I'll find a solution. There are some issues that could arise when using multiple copies (particularly corrupt settings files) but I understand the desire. I will find a way to make this work intentionally.