Sound

Playing a clip from a blueprint, and the handle every later node needs to reach it again.

Seven nodes for the sound an interface makes: the click of a button, a hover tick, an ambience a Page starts while it is up. The music and effects a story plays belong to the story and are written as /bgm and /sound rows there.

Conventions

Every one of them is latent. They declare event and macro, so none can appear in a function graph or back a Blueprint Value.
Play Sound hands back a handle, and the other six take it. The handle names the playing clip, not the asset — start the same clip twice and you have two handles that stop, seek and fade independently.
The clip is chosen on the card. Audio Clip picks the asset and Track picks the audio track it plays on, so the player's volume for that track applies. The Asset Id pin is for the case where the clip is decided at run time.

Play Sound

blueprint.sound.play · Latent

Starts a clip and returns the handle that reaches it afterwards.

Pin	Direction	Type	Notes
`in`	in · exec	—
`assetId`	in · data	`string`	Optional. Overrides the card's `Audio Clip`, for a clip chosen at run time.
`loop`	in · data	`boolean`	Optional, literal.
`volume`	in · data	`float`	Optional, literal.
`fadeIn`	in · data	`float`	Optional, literal. Seconds.
`next`	out · exec	—
`handle`	out · data	`SoundHandle`	What every other node in this category takes.

On-card fields

Field	What
`Audio Clip`	The audio asset to play.
`Track`	The project audio track it plays on, so the player's volume for that track applies.

Stop Sound

blueprint.sound.stop · Latent

Pin	Direction	Type	Notes
`in`	in · exec	—
`handle`	in · data	`SoundHandle`	Optional.
`fade`	in · data	`float`	Optional, literal. Seconds.
`next`	out · exec	—

Pause Sound

blueprint.sound.pause · Latent

Pin	Direction	Type
`in`	in · exec	—
`handle`	in · data	`SoundHandle`
`next`	out · exec	—

Resume Sound

blueprint.sound.resume · Latent

Pin	Direction	Type
`in`	in · exec	—
`handle`	in · data	`SoundHandle`
`next`	out · exec	—

Seek Sound

blueprint.sound.seek · Latent

Pin	Direction	Type	Notes
`in`	in · exec	—
`handle`	in · data	`SoundHandle`
`time`	in · data	`float`	Literal. Seconds from the start of the clip.
`next`	out · exec	—

Set Sound Volume

blueprint.sound.setVolume · Latent

Pin	Direction	Type	Notes
`in`	in · exec	—
`handle`	in · data	`SoundHandle`
`volume`	in · data	`float`	Optional, literal.
`fade`	in · data	`float`	Optional, literal. Seconds — this is how a clip is ducked under a line rather than cut.
`next`	out · exec	—

Is Sound Playing

blueprint.sound.isPlaying · Latent

Pin	Direction	Type
`in`	in · exec	—
`handle`	in · data	`SoundHandle`
`next`	out · exec	—
`isPlaying`	out · data	`boolean`

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