Ye, I have Sound Assistant (I think that’s what you’re referring to). It looks like it’s been updated because I’m almost certain it used to only let you pick one app, but now you can choose all apps. It still only has the option for none, one or all apps though (no option to allow just some apps).
You can play multiple audio streams simultaneously on Samsung phones. There’s an app in Samsung’s app store you need to download, but it’s possible
Ye, I have Sound Assistant (I think that’s what you’re referring to). It looks like it’s been updated because I’m almost certain it used to only let you pick one app, but now you can choose all apps. It still only has the option for none, one or all apps though (no option to allow just some apps).