How can I change the volume of the notification sounds on the AirPods Pro?

The sounds used when switching between transparency modes don’t seem to be adjustable, but notifications can be adjusted.

You can adjust the notification volume used both when AirPods are connected and when they are not (the volume will be the same for both).

Go to “Sounds & Haptics” in settings, and adjust the volume slider to your desired volume (note that the ringer preview will come out of your phone even with your AirPods in).

You can test the volume in your AirPods by previewing one of the “sounds and vibration patterns” below.

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For more control, you can set volume of ringer and alerts to be set by the volume buttons (directly below the slider).

You have to adjust the volume as she is speaking. I had to message myself a long message and I was able to adjust her; I was having the same issue. Music and call volumes were fine, but she was whispering my notifications to me.