Im not sure why the app doesn’t work with my mac book and somehow over rule the sound settings. It happened to me more than once where my headphones are connected to my mac and when i listen to music the headphone work fine but when i turn on peech they don’t connect to my headphones and i can’t mute it. This is really annoying especially when im in a library and it’s dead silent and i press play only for it play out loud. I have a video of the problem but my file is too big to upload.