### 1.1.84 SustainEvent

Depress or release sustain pedal.

Event classes: music-event, pedal-event, span-event, StreamEvent and sustain-event.

Accepted by: Piano_pedal_engraver and Piano_pedal_performer.

Properties:

> `name` (symbol):

>   `'SustainEvent`

>   Name of this music object.

> `types` (list):

>   `'(general-music post-event event pedal-event sustain-event)`

>   The types of this music object; determines by what engraver this music expression is processed.

#### Internals Reference v2.18.2 (稳定分支).