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Overview of the MIDI Transform window in Logic Pro for Mac

The MIDI Transform window is so named because it transforms MIDI events—based on conditions, operations, and values you choose—into different types of events, or events with different values.

The MIDI Transform window is a powerful tool for edits that would otherwise be impossible (or tedious). For example, imagine an orchestral project that has been sent to you for editing. The individual violin and viola parts were recorded with a different string library. Two hundred MIDI regions contain aftertouch information that introduces an unpleasant pitch modulation, and some sample layer switching artifacts when played with your string samples. After looking at this aftertouch information, you discover that only a small range of values is causing the problem. Your options: edit your sampler instruments, manually remove all aftertouch information (region by region, or globally, thus losing the performance benefits that the aftertouch information provides), or alter the problematic values in the MIDI Transform window.

A number of preset transform sets are available for many common editing tasks. These may be all you’ll ever require, but should the need arise, you can create and save your own transform sets, and recall them later.

Figure. Transform window showing Random Velocity.

Tip: The Environment contains a similar transformer object that you can use for real-time transformations of MIDI events. See Transformers in the Environment.

Open the MIDI Transform window

In Logic Pro, do one of the following:

  • Choose Window > Open MIDI Transform (or use the Open Transform key command, default assignment: Command-9).

  • If you want to transform events that you have selected in one of the MIDI editors, choose a preset from the Functions > MIDI Transform submenu.

    Note: You can choose the Window > Open MIDI Transform command while you are in a MIDI editor, but you need to manually select a preset.

Download the guides:

Logic Pro User Guide: PDF

Logic Pro Instruments: PDF

Logic Pro Effects: PDF

Control Surfaces Support Guide: PDF

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