Hierarchy classification:

1. top of the aat hierarchies
2. Objects Facet
3. Furnishings and Equipment (hierarchy name)
4. Sound Devices (hierarchy name)
5. sound devices (equipment)
6. [sound devices by acoustical characteristics]
7. electrophones
8. electronic instruments
9. electronic effects devices

Anotations

Scope note:

Devices for electrical or electronic musical instruments that, when activated, often via a footswitch, add auditory effects to a signal. These are most commonly intended for performing with electric guitars.