I stumbled upon one audio feature that I haven’t seen anybody mention at all. Under macOS 26 (Tahoe) in the Audio MIDI Settings, you can directly rename audio ports at a system level for individual audio devices, not just for aggregate devices, as was previously the case. It helps certain audio apps to automatically label your ports. See examples below:
Also, the Audio MIDI Settings icon has been updated. Trivial to some, perhaps, but that small visual difference means the app “MidiTest” (to the right of the aforementioned application) is now visually differentiated. Formerly, these icons were virtually identical and there are many such keyboard-themed icons for various MIDI utilities.
Not saying OP should go to Tahoe – there are good reasons not to update!