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# setBoolValue(_:toParameter:at:)

Sets the value of a Boolean parameter.

```
func setBoolValue(_ value: Bool, toParameter parameterID: UInt32, at time: CMTime) -> Bool
```

## Parameters

`value`

Specified value for the parameter.

`parameterID`

Unique identifier for the parameter.

`time`

Specified time to set the value.

## Return Value

Returns `YES` if the value is set successfully; `NO` otherwise.

## Discussion

Depending on the host application, the time value may be relative to the start of the timeline or to the start of the clip. See [Understanding time in FxPlug](/documentation/Professional-Video-Applications/understanding-time-in-fxplug).

---

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