So I just bought iRig stream couple of days ago.
In conclusion, without record app or DAW. It acts crazy.
The basic of Audio Interface is to monitor its inputs constantly and flawlessly.
But It cannot do that.
I tested all cable(usb c, lightening, usb a) and same result
In iOS, monitor only activated when record app run
In macOS, monitor only activated when DAW or record app run
So If this is not Quality Problem, but Design issue,
Then I strongly recommend to reconsider to buy this.
I hope it is just Quality Issue, and get replacement or refund.
And already mailed them.
If any other person experience same issue, please comment