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I know just about nothing about Apple ecosystem, but there's exactly that in Windows called App Volume and Device Preferences. The article mentions 3rd party apps only for older system versions, but I'd suspect someone wrote something like that for iOS/whatever.The first option is to have some sort of built-in mixer into the OS, that allows me to specifically route specific app outputs to different places. So, send Spotify output to the Bluetooth connected device (speaker in the shop, or car stereo, for example) and send all other audio through the phone's built-in speaker.