The alarm volume may gradually increase automatically as the alarm or alarm tone on the OnePlus smartphone sounds for a longer period of time.

To do this, the ringtone starts at a lower volume and increases to the maximum volume set.

Android 10 | OxygenOS 10.0
Step 1:  Open the  Clock app
Step 2:  Open the  Settings
Step 3:  Enable or disable  Increasing volume
  1. Open the Clock app
  2. Open the Settings
  3. Enable or disable Increasing volume

OnePlus Instructions
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