On the old Mac, Built-in Mic is stereo, but on the new one, It is a Mono. Even when I attach external headphones with USB.
Can anyone recommend some kind of audio virtual tool to correct this (for example,
something like audijingle)?
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Microphones in headsets are always only mono. I have never seen stereo versions. And microphone recordings are usually a bad idea because of all environment noise they also record.
Tell us what you want to record.
Thank you mac-christian, but as you can see from one of my screenshots (attaching it again), they are not "always " mono. Now you’ve seen an example for the first time 
(MacBook Pro, early 2015). And the quality I am getting, with a good headset is good enough.
So, the question is not if it is possible (but thank you v much for (man)explaining this to me 
), but does anyone have a potential solution?
I know that one can always record in mono and then do the simple transformation to stereo like you would do when transferring voice recordings from an iPhone, but I was thinking more about something that could be used directly in Audacity, like some virtual audio driver like Audiojingle or similar.
Thank you!
He said headset mics are mono. Some laptops may have 2 mics but a normal headset only has one.
A true-mono file will play out of both sides.
@DVDdoug and @mac-christian, I was talking/asking about Built-in Mic or MAcBook Pro Mic (called like this on the new MacBook Pro). Even my title says this.
Why would either of you bring headsets into this?
My post is literally 2 sentences, 1 question and 3 screenshots that showcase what I meant by my title and the post.
Why are you guys making this complicated but still not suggesting the solutions 
?
They may have mentioned headsets since you mentioned connecting USB headphones.
You say the “old Mac” presents the internal microphone as 2 channels, and that the “new Mac” presents it as 1 channel. So this seems to be a change in the way the Mac presents the microphone signal to applications. Open Audio MIDI Setup (in the Utilities folder) to confirm this.
I don’t know of any tool that specifically takes a mono source (microphone or whatever) and makes it a stereo source. Blackhole might be able to do it. You mention AudioJingle - have you tried it? Given the discussion here I’d avoid it.
Why do you care? A mono microphone that is recorded in stereo will just have two identical stereo channels. If it is recorded in mono it will have one channel, will play back through both speakers, and will sound identical to the stereo recording. One advantage of the mono recording is that you can easily pan it left or right if you want to.
Because “Plantronics Blackwire…” is a headset (see your screenshot).
If one Mac has only a mono microphone, you can’t do anything about it.
Hey @billw58 , yep it’s exactly that. Mac changed in this way, that’s where the problem ultimately is.
I used Audiojingle on my old Mac to record from the computer. It actually worked well. Blackhole works similarly. I couldn’t really make it work for this particular case, but to be honest, I haven’t tried too much, maybe I’ll invest some time and see.
You are right, I can also just replicate the mono to the second channel and make it stereo like I was doing with voice messages from my iPhone.
But, I guess we are all creatures of habit. When I record my radio show, it is convenient to record my voice and mix it up directly with the music, as I was doing on my old Mac. No fancy setup, just in-built Mic and Audacity.
This is why I reached out to the community to see if anyone has any suggestions to keep it this simple, but I guess with Mac changing this, there is nothing else available.
I’ll leave this post open for the moment, just in case there is something else, but I doubt it.
Thank you!
That was playback, output, I was talking about the mic.
You can mix a mono voice track with stereo music just as easily as mixing a stereo voice track with stereo music. The result of the mix will be a stereo audio file. You don’t have to add the steps of duplicating the mono voice track then converting the two tracks to stereo.