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# FxCustomParameterInterpolation_v2

Defines the methods a plug-in needs to implement to support keyframing custom parameters.

```
protocol FxCustomParameterInterpolation_v2
```

## Overview

An FxPlug 4 or later plug-in that wants to support keyframing custom parameters must conform to the `FxCustomParameterInterpolation_v2` or later protocol. This protocol allows the plug-in to generate interpolated (in-between) values between keyframes.

Note that this protocol intentionally does not inherit from the `FxCustomParameterInterpolation` protocol, which is for older-style plug-ins.

## Topics

### Instance Methods

[`func interpolateBetween(any NSCopying & NSSecureCoding & NSObjectProtocol, withWeight: Float) -> any NSCopying & NSSecureCoding & NSObjectProtocol`](/documentation/professional_video_applications/FxCustomParameterInterpolation_v2/interpolateBetween(_:withWeight:))

Returns a new parameter value which has been calculated by interpolating between                 two key values.

[`func isEqual(any NSCopying & NSSecureCoding & NSObjectProtocol) -> Bool`](/documentation/professional_video_applications/FxCustomParameterInterpolation_v2/isEqual(_:))

Returns whether one custom parameter value is equal to another.


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