Settings > Control Center > Customize Controls > Tap the green + next to Screen Recording.
Then enter Control Center, 3D touch (meaning a hard press) on the Screen Recording icon in order to turn on audio recoding from the microphone as well, then tap Start Recording.
Stop recording by taping the red bar at the top of the screen.
You could also reset Siri altogether, which should delete all your personalized Siri data and force it to relearn your speech. I have no idea how helpful that will really be, but if you want to try it go to
Settings > Siri & Search > turn off both Listen for “Hey Siri” and Press Home for Siri.
then
Settings > General > Keyboard > turn off Enable Dictation.
Then turn it all back on. Don’t forget, it will have to relearn your speech all over again, so this is a bit of a throwing the baby out with the bathwater solution and as I mentioned I have no idea how much it will help. You could just be one of those people Siri doesn’t play well with.
Like the noise in your car engine that disappears when you take it to the mechanic, I had a hard time getting this behavior to show up on the recordings, like it was shy on camera. But I will note that this was mostly because the text was so wrong from beginning to end. Maybe screen recording at the same time taxes the processor too much? (It definitely did not allow me to record my voice at the same time as voice to text.) Even in the cases where I got some minor examples to show up, you will notice that most of rest of the passage is messed up from the start. As I said in my OP, it’s not usually that bad, or I probably would have given up on it long ago.
But here are the minor examples I did record:
(1)
The correct phrase “…the former hopes to ensure that the country remains standing” is there for just a split second, but then inexplicably changes to “…romance standing”. Isn’t there some kind of basic grammar engine that would not need to be concerned solely with which one it sounds like, but also which one is grammatical? Apparently not!
(2)
The first part of this sentence, up to the comma, was not quite right—but so very close!—until the very end. It is supposed to read “The middle-aged heroine travels out of the city to see her son”. As you will also see in the next example, it seems particularly fond of removing the first word I say, even though I can plainly see that it was picked up by the microphone.
(3)
Sure, this might the most minor example of all. But the beginning of the sentence once again was exactly correct: “He is constantly crying, his mother says”. This is changed to “Is constantly crying, his mother says”. Which means I not only have to add the “He” but change the “Is” to lowercase “is”. Again it decides to ditch my first word for no understandable reason, and again this makes the sentence grammatically incorrect.
I did think this was kind of funny though, because the New Yorker story I was reading from was about a Russian family—and after the change, it does sound more like the broken English a Russian émigré might speak.
I used to get weird emails from my boss when he was on the road. On particularly bad ones, I’d preface my reply with an assertion that Siri was drunk - I think he got the message because they are much cleaner now.