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Values your game can change

Choose Float, Int, Bool, or Asset parameters and apply starting values in time.

A parameter is a value your game can change for one play, so two engines can have different speeds. A constant is a fixed value saved in the graph. If the first command needs a particular value, supply it with SoundPlayContext.With(...) before calling Play. You can update live parameters afterward while the sound runs.

See it in a complete example: Engine live parameters.

For the full list, open the node catalogue.

Float Parameter

Reads a decimal parameter belonging to this play. Runtime changes move toward the target using Rise Rate or Fall Rate in units per second. Initial values are applied immediately.

Parameters · purple headerColor key

Float Parameter node in the Unity graph editor, showing its controls and ports — Unity node · Float Parameter.

Ports on Float Parameter
Direction	Port	Value
Output	`Value`	Float

Set it up. New node: Parameter Volume, Default 0.5, Min 0, Max 1, Rise/Fall Rate 0. Zero rate means immediate changes. Use generated parameter IDs in code.

Try it. Engine RPM can raise speed gradually without abrupt jumps.

Float

Supplies a constant decimal number. It has no execution input and does not change during a play.

Values · green headerColor key

Float node in the Unity graph editor, showing its controls and ports — Unity node · Float.

Ports on Float
Direction	Port	Value
Output	`Value`	Float

Set it up. Set Value; its default is 0. Use a parameter node when gameplay needs to change it.

Try it. Set a fixed gain of 0.6.

Bool

Supplies a constant true/false value. It has no execution input and does not change during a play.

Values · green headerColor key

Bool node in the Unity graph editor, showing its controls and ports — Unity node · Bool.

Ports on Bool
Direction	Port	Value
Output	`Value`	Bool

Set it up. Set Value; its default is false. Use a parameter node when gameplay needs to change it.

Try it. Temporarily choose the true branch while testing.

Int Parameter

Reads a whole-number parameter. Accepted values are clamped to its declared range; there is no time smoothing.

Parameters · purple headerColor key

Int Parameter node in the Unity graph editor, showing its controls and ports — Unity node · Int Parameter.

Ports on Int Parameter
Direction	Port	Value
Output	`Value`	Int

Set it up. New node: Parameter Index, Default 0, Min 0, Max 100. Match the range to your choices.

Try it. Footstep Surface selects one of three banks with values 0–2.

Bool Parameter

Reads a true/false value from this play. Use it to allow an action or choose a branch.

Parameters · purple headerColor key

Bool Parameter node in the Unity graph editor, showing its controls and ports — Unity node · Bool Parameter.

Ports on Bool Parameter
Direction	Port	Value
Output	`Value`	Bool

Set it up. New node: Parameter Enabled, Default false. Pass the starting value in the play context when the first branch needs it.

Try it. Launch waits until LaunchAllowed becomes true.

Asset Parameter

Reads the currently selected clip. Only a clip declared in Allowed Clips is accepted. Changing it affects future Play Audio starts, not the source of a voice already playing.

Parameters · purple headerColor key

Asset Parameter node in the Unity graph editor, showing its controls and ports — Asset Parameter with an example default clip assigned.

Ports on Asset Parameter
Direction	Port	Value
Output	`Asset`	Clip

Set it up. New node: Parameter Clip, Default empty. Assign a non-null default and include it in Allowed Clips before the graph can validate.

Try it. Jukebox changes the incoming track, starts its other voice, and crossfades the volumes.

Int

Supplies a constant whole number. It has no execution input and does not change during a play.

Values · green headerColor key

Int node in the Unity graph editor, showing its controls and ports — Unity node · Int.

Ports on Int
Direction	Port	Value
Output	`Value`	Int

Set it up. Set Value; its default is 0. Use a parameter node when gameplay needs to change it.

Try it. Set a branch index to 2.

Continue with graph checks and debugging if a connection or event is refused.