There is no USB driver needed for Mac computers, all Soundcraft products are Core Audio compatible.

From preliminary testing with an M2 MacBook Air on Tahoe 26.0.1,  Notepad mixers appear to be fully functional.

From preliminary testing with an M1 MacBook Pro on Big Sur 11.3,  Notepad mixers appear to be fully functional.

When testing a power supply brick for the Notepad mixer, start with the power supply un-plugged from the outlet and disconnected from the Notepad mixer.

1. Plug the power supply brick into the outlet.  
2. Is the small green LED on the power brick lit when plugged in?
   1. No: Power supply is bad
   2. Yes : Now connect the power supply to the mixer, is it still on?

If the LED on the brick goes off when plugged into mixer, the mixer has a bad internal power supply and will need service.

This is a basic test, there are other factors that could cause false results.  

Yes. They are plug and play compatible; no additional driver needed.

Yes, the Notepad series are plug and play compatible with macOS Sonoma; no additional driver needed.

Yes, the Notepad series are plug and play compatible with macOS Sequoia​; no additional driver needed.

• If the Current Firmware version is lower than v1.09, update the firmware as follows:  In the Update Utility's window, verify that the Notepad mixer has been detected (text will say, "Device opened. Ready for firmware update from version 1.xx ​to 1.09").

• Click the Start button in the bottom right of the Firmware Upgrade window. A progress bar will be displayed and show a notification when successfully complete (see screenshot below). 
• The firmware update should complete within 30 seconds. 
• If it doesn't start, or shows a fail message, power cycle the Notepad, close and re-open the Firmware Update window and try again. 

• After successful firmware update, the Notepad should be power-cycled to ensure it is detected by the computer’s USB interface before using for audio.

All Notepad mixers have the same external, 18V, 1.3A mid-lead power supply.  Although the Ui12 and Ui16 also has an external, 18V, 1.3A mid-lead power supply, it is not the same.  The Ui power supply has a power adapter with a threaded locking ring to prevent accidental removal.  On the Notepad mixers, you can fix the power cable with a cord restraint located on the back of the mixer to prevent accidental removal.

In doing a podcast where you also need to listen to far-side audio, you will need to setup what is called a "mix minus" on the mixer, so as not to create a loop form the return back into the send.

Scenario - you mix and send the mixer's L&R to the computer streaming or recording the podcast. It is a mix of the local microphones, but you also need to listen to the return from the computer to hear far side audio. When you bring up the return channel, you get a feedback loop, especially on the far side.

Solution - create a "mix minus" using an Aux send whereas you only have the local mics in that mix. You will listen to the complete mix in headphones from the Aux, hearing the local mics and far side audio, but the L&R send going to the computer will only send the local mics from the mixer, eliminating any feedback looping.

Here's how to do it - on the mixer, create your listening mix with mics and the return channel on the Aux bus, including the stereo computer return channel. In the L&R mix, only bring up the local mics. The far side will hear just the local mics from the mixer, but you will hear the local mics and the far side audio in the headphone mix, by listening to that Aux mix.

Note: The Aux Bus sum is sent to the Aux Master output level control. This sum is made up of the aux send pre-fade contributions from each channel. That is, the sends are taken before the input channel fader and are not affected by the input channel fader levels. So your headphone mix is totally independent of the L&R mix going to your computer. You can listen back and forth by selecting either L&R or Aux on the headphone mix select button​.