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This feature is immensely useful for anyone who composes and edits MIDI performances. Realtime MIDI properties are non-destructive, real-time versions of many of the MIDI processes already available via the MIDI menu in previous versions of Pro Tools. Without altering the original contents of the MIDI regions on the track, you can apply quantization (including the same parameters available in the “destructive” version, such as swing and groove quantize), duration and velocity changes, delay offset, and transposition (including diatonic transposition within the current key signature in Pro Tools versions 7.3 and higher). You also have the option of permanently incorporating the result of the current real-time MIDI properties into the affected region or track using the Write to Region/Write to Track button in the Real-Time Properties window. You can display these parameters in the Edit window (see Figure 6.37) via the View > Edit Window > Real-Time Properties command. Using real-time properties on MIDI and Instrument tracks is discussed further in Chapter 10, “MIDI.” That chapter also discusses how you can apply real-time properties to individual regions on MIDI and Instrument tracks, as well as apply real-time properties to the track itself that will affect all MIDI data played back through it (including regions that already have their own real-time properties).