how to set input device to none

Ok. After some sleep and a cup of coffee I made some progress on this.

On my setup (macOS 10.14, Logic 10.4.8) it appears that my I/O devices in Audio Preferences are "(Built-in Microphone)" and "(Built-in Output)". Note the "()". This means the device selection is temporary. It happens when you had an Audio Interface previously selected and it is not connected when you start Logic.

In that situation I can select None for Input but cannot Apply Changes. I made a slight change to another parameter and now I can Apply Changes. I click Apply Changes and the Input revert back to "(Built-in Microphone)"! Interesting.

I select "Built-in Microphone" (no "()") and I can Apply Changes. I don't click on it.

I then select None and click Apply Changes. The Input stick to None!

It looks like Logic force an Input when it uses a temporary selection.

Hope that makes sense? Anyone can reproduce the above behavior?

WD

WD, yes, I can confirm.

If I pull up preferences and change the input to another available input, Apply Changes becomes active, then I can select NONE and apply changes.

Hmmmm.. I'm using Sierra and Logic 10.4.4, I can get None to stick, did you click on "Apply Changes" after selecting None?

You can also go into the computer's System Preferences/Sound Input Tab and slide the Input volume to off.

Oh I see, you can't even select None.

Just booted up with High Sierr and Logic 10.4.8 and can still choose None as an Input device and make it stick. It's either the Catalina OS or the hardware on the new Macbook Air, the audio controller is in the recent T2 security chip.

Thanks for the feedback Pancenter,

I don't know if this behavior is by design or a mistake ("Bug") in handling default I/O devices in recent versions in Logic. I never noticed it because I barely use the Built-in Input or has to set the Input to None.

At least, I think we have a workaround for the OP.

WD

I'm glad it solved your problem and thanks for the feedback.

May I suggest you report the issue and the workaround to Apple: Feedback - Logic Pro – Apple.

On my side I will do more test as I suspect this may affect other I/O parameters.

Thanks,

WD

I tested on Mojave and Logic 10.4.8. I can select None but it doesn't stick. It's on a 2017 MacBook Pro (without the T2 chip).

I will investigate further later.

WD

It probably has to do with the Security Setting in Mojave and Catalina, I don't use either so can't confirm. The input device has to be given permission.

Pancenter,

At least in my setup it is not related to Mojave Security Settings. Look at my other post.

WD