- Notifications can communicate actionable UI elements using custom sound.
- https://kstatic.googleusercontent.com/files/ba195074fbd05e5234cf6d15d0a8fbc28eca9bd198419f72081b676a7ee60f49fa4c08614b7524dcb70dc8ee1cfa85d0e45216fefd4f2e0b51e70455c6d61ca4
- Alerts use brighter timbres and energetic composition to draw attention or convey urgent information. 
- https://kstatic.googleusercontent.com/files/c87dc6896799caa44815a02b4e42ef31413b0c698b914a6dd4e2d981b83b567525c977b3485ab9c838d02d3e07b5642605b613a04842fd13d8466fc796d63f33

University of Michigan - Ann Arbor

Notifications are prominent requests for user attention. Their primary role is to help direct user attention, and they provide an opportunity to give a custom sound identity to emphasized interactions. Because they occur more frequently in a UI than other sounds, they should generally be shorter than hero sounds and crafted in a way that is suitable for being played multiple times.

- Environmental factors
- Notifications and alerts
- Ringtones, alarms, and timers

Notifications

Material Design Documentation

Notifications should be designed to be audible from a variable range of user distances from a product, and in scenarios like loud environments. The sound itself can vary to attract the focus of the ear, using:

- rhythmic, 
- tonal, and 
- frequency variation.

It’s recommended to provide options that allow users to personalize notifications, with options that range from basic, non-decorative sound to rich, decorative sound.

Environmental factors

Ringtones, alarms, and timers are alerts that often have a playful style. They can be customized to suit user preferences and brand personality.

- Ringtone example
- Alarm/timer example

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