Hi Mad76
I use libre ,MiaoMiao, Glimp and Samsung combo. I have the Samsung j6 so there maybe sound difference in setting things up.
I hope you can follow my ramblings and they make sense. If not please let me know.
In Glimp go to the 3 dots on the top of the screen, then options, then Glucose.
On this screen you can set your min,max levels Glucose levels.
Now go into the settings section on your phone. Then sound and vibration. Go into notification sounds and select the sound you want.
Next go into volume and set the notifications one to the level you need..
Next go into Notifications which is also in settings and go into Glimp. Then select show notifications.
Bellow this you will see all the different things Glimp will alarm for. Switch on those you wish.
Under each one you will see sound. Select that and then select notification style and sound you want
Hope this helps