<!--
{
  "availability" : [
    "iOS: -",
    "iPadOS: -",
    "macCatalyst: -",
    "macOS: -",
    "tvOS: -",
    "visionOS: -",
    "watchOS: -"
  ],
  "documentType" : "symbol",
  "framework" : "CoreMIDI",
  "identifier" : "/documentation/CoreMIDI/MIDITransformType",
  "metadataVersion" : "0.1.0",
  "role" : "Enumeration",
  "symbol" : {
    "kind" : "Enumeration",
    "modules" : [
      "Core MIDI"
    ],
    "preciseIdentifier" : "c:@E@MIDITransformType"
  },
  "title" : "MIDITransformType"
}
-->

# MIDITransformType

Values that specify the type of MIDI transformation.

```
enum MIDITransformType
```

## Topics

### Transform Types

[`kMIDITransform_None`](/documentation/CoreMIDI/MIDITransformType/none)

No transformation.

[`kMIDITransform_FilterOut`](/documentation/CoreMIDI/MIDITransformType/filterOut)

A transformation that filters out an event type.

[`kMIDITransform_MapControl`](/documentation/CoreMIDI/MIDITransformType/mapControl)

A transformation that changes a specified control number to a supplied parameter value.

[`kMIDITransform_Add`](/documentation/CoreMIDI/MIDITransformType/add)

A transform that adds a parameter value.

[`kMIDITransform_Scale`](/documentation/CoreMIDI/MIDITransformType/scale)

A transform that multiplies by the specified parameter value.

[`kMIDITransform_MinValue`](/documentation/CoreMIDI/MIDITransformType/minValue)

A transform that sets the minimum value to the specified parameter value.

[`kMIDITransform_MaxValue`](/documentation/CoreMIDI/MIDITransformType/maxValue)

A transform that sets the maximum value to the specified parameter value.

[`kMIDITransform_MapValue`](/documentation/CoreMIDI/MIDITransformType/mapValue)

A transform that maps one value to another.

## Relationships

### Conforms To

[`Hashable`](/documentation/Swift/Hashable)

[`Sendable`](/documentation/Swift/Sendable)

[`SendableMetatype`](/documentation/Swift/SendableMetatype)

[`RawRepresentable`](/documentation/Swift/RawRepresentable)

[`Equatable`](/documentation/Swift/Equatable)

[`BitwiseCopyable`](/documentation/Swift/BitwiseCopyable)

---

Copyright &copy; 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)