What is the primary function of 'MIDI Control Change' messages in Pro Tools?

The primary function of 'MIDI Control Change' messages is to send information about MIDI controller parameter changes. These messages are essential for dynamic control within MIDI environments, allowing users to modify various aspects of their MIDI signals in real-time.

When you use a MIDI controller, such as knobs or sliders, each movement can produce a Control Change message that specifies the parameter being adjusted and the new value of that parameter. This allows for flexible and expressive control over elements like modulation, panning, and other effects within the Pro Tools environment. This functionality is crucial for musicians, producers, and engineers as it enables them to craft nuanced performances and manipulate sound with precision.

The other options describe different functionalities that do not accurately capture the role of MIDI Control Change messages. For example, modifying audio effects or syncing tempo involves different signal types and control mechanisms within the software. Similarly, controlling volume levels can be handled through separate MIDI messages and mixing elements rather than exclusively via Control Change messages. Understanding the correct application of these messages is vital for effective MIDI programming and audio production in Pro Tools.