Every app on one volume scale.
Sound has the output with its menu and a large slider, beside whatever is playing. Under them is every app on one volume scale, from 0% to 150%, with 100% as a single line through all of them.
MacBook Pro Speakers
62% volume
Each app gets its own volume, from 0% to 150%.
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Every bar is a setting.
Macometer measures no audio, so nothing on this page is a level meter. The bars are volumes you set, in plain grey, because they are not readings.
It asks when you move a slider.
Per-app volume needs the audio capture permission. macOS asks the first time you move an app's slider, and not before.
Nothing playing, nothing to fake.
While nothing is playing, the panel beside the output lists every output instead. With no apps yet, the page says plainly what will appear.
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