Is there a way to get GarageBand to stop using my iPhone mic?

Since an update Garageband (on my macbook) uses the microphone of my Iphone automatically as soon as any other microphone device is disabled. On my Iphone I ask to "quit", on my Macbook I change the settings to "none" BUT I need to do that for EVERY audiotrack. That's a pretty heavy job :-(

So when I try to work on GarageBand ALL the sounds of my breathing, my movements and so on are CONSTANTLY there.

Is there, please, a way to stop GB from using my Iphone like for the rest of my life?

[Re-Titled by Moderator]