Dexcom One Changing alert tones

[h884]

Hoping some dexcom one users can help me here. I am having difficulty changing the alert tones.

I know how to find alerts and change the level they alarm at but cannot seem to be able to change the alarm tone.
Thanking you in anticipation

 

[wes.w]

The android phone app is as follows:
1. Go to settings (bottom of app right hand side)
2. Scroll down to Alerts and tap to select
3. Choose low or high Alert and select (alert needs to be turned on to get to tones!)
4. Tone is 3rd item, tap to select, then select required tone from list