iRig Duo/VocaLive has been frustratingly unreliable for me. I follow the same sequence when plugging into my iPhone 12 Pro.
Sometimes, everything works fine. As soon as I plug in, the audio is routed to the iRigDuo and I can monitor with my earphones.
Other times, the audio will continue to be routed through the iPhone's speakers.
Worse still, for no apparent reason, VocaLive will keep crashing at launch.
Also, sometimes, only 1 channel will record; other times two.
NOTE: EVERY time, I am following the EXACT same sequence of plugging in and using the app.
Feel like I have wasted my money.