Many of the tones such as off course and turn notification are too high for me to hear. Some of the other tones like GPS Signal lost are about as high as I can hear. I know folks have the same trouble with the wearables but at least there you can enable vibration for notification. That isn't an option for the Edge units. Please add an option so we can modify the pitch of the tones. It might also be useful to be able to pick a volume as well. Especially on windy days in the winter when your ears are covered, it can be hard to hear.