F-REX is a dynamic audio remixing tool that analyzes sound in real time by breaking it down into three key parameters: Gain, Frequency, and Panning. It offers a visual representation of these elements, allowing users to see the audio characteristics as they evolve. This approach enables precise control over different parts of the sound, making it easier to isolate and manipulate specific audio components.

The plugin allows independent adjustment of the inside and outside areas of a focused sound segment through panning and frequency controls. Users can apply effects like compression and reverb separately to these areas, while intuitively managing volume and spatial placement. This level of control helps in refining audio tracks and crafting unique mixes by emphasizing or minimizing particular elements within a song.

F-REX is particularly useful for creating 'minus-one songs' by identifying and reducing the volume of specific sounds such as vocals, which can aid in practice or remixing sessions. It also supports noise cancellation and enhances the clarity of individual instruments, making it easier to learn and appreciate complex arrangements. While it requires a VST or AU host to operate and may have limitations with blurred panning sources, F-REX remains a powerful tool for innovative audio remixing and sound design.