At the moment, please do not upgrade to macOS Tahoe if you use Default Output Capture or any of the output sources in MiniMeters.
macOS Tahoe 26.1 has an issue where buffer underruns can cause audio capture to fail for that particular application. This is most noticeable in DAWs like Ableton Live and Logic. I have opened a ticket with Apple to hopefully get this resolved (FB21082595).
If you have already upgraded and are running into issues please use MiniMeters - Audio Server to send audio into MiniMeters.
EDIT Nov 22, 2025: I may have found a workaround for this issue. I am going to continue work on it and test it. Hopefully it will succeed and I can push it in an update shortly. Thanks for your patience.