smoakeater You can modify app notification permissions, revoking Voice Access's will banish it from your notification screen, and likely same with your music streaming app. It's a bit convoluted to navigate to the android settings not listed in the Flip's default settings menu, I use Button Mapper to get there. Temporarily change the input of some key (eg volume) to Shortcuts > Settings shortcut > App info. Press the remapped button and scroll down to the app whose notifs you want to change. For Voice Access I have just disabled all of its notifications. I don't need em, I can toggle it on and off with the hotkey.
Also, to get to a searchable Android settings that lets you search for any Android setting you want, do the same thing but instead map Shortcuts > Settings shortcut > Location > App level permissions > Touch the magnifying glass with Voice Access or some kind of pointer > viola, settings search box!
Edit: somehow missed that Darth already answered that haha, well now you have two methods