What is the main function of a packaged hoist?

A packaged hoist is primarily designed to lift heavy objects, such as large scenic elements, during a production. These hoists are typically used in stagecraft to raise or lower backdrops, set pieces, and other large items that are integral to the performance environment. By effectively handling these loads, a packaged hoist contributes significantly to the safety and efficiency of scene changes and technical effects on stage.

The other options do not align with the function of a packaged hoist. For example, enhancing audio playback quality, securing lighting equipment, and manipulating sound levels pertain to other specialized equipment or roles within stagecraft production. Each of those roles is critical to a successful performance, but they do not involve the mechanical lifting capabilities that define a packaged hoist's primary purpose.