The MOTU M2 has loopback, which doesn’t seem to work under Big Sur, even though I have the newest MOTO driver installed. The driver doesn’t offer anything. In Windows I can change the sample- and bitrate and under system settings I can choose the loopback option - same in Audacity itself. There are multiple “source” options.
I don’t think there is a way to manually route anything. There’s a USB-C cable coming from the Mac mini M1 (basically audio out) into the MOTU M2 (basically audio in). There are two mono inputs in the front but they can only be used with other external devices.
Don’t get me wrong, I’m not here to rant but it’s pretty baffling that the newest MacOS can’t do what Windows 95 could do. Maybe it’s Audacity for Mac that doesn’t offer the loopback option, I don’t know. In any case it should not be hard to record audio from the browser, e.g. a youtube video where you need a 10 second clip from a speech or something.
You have to select 3+ channels in Audacity to record Audio, because cannels 3-6 (6 is max. on the M2) are the loopback channels. But you’ll have as many record lanes as you’ve selected in Audacity. Lanes 1 and 2 don’t have any audio and all the other lanes are just mono.
I’m not stingy or anything but I paid over 1000 dollars for the Mac, almost 200 dollars for the Motu M2 and 600 dollars or so for Ableton Live already. It really shouldn’t be necessary to spend another 70 or 80 dollars on an app that can record audio from a browser, which should be an absolute standard feature of every OS… well it was since the Audio Recorder in Windows 95.