When working with an Aux Input, which audio processing feature is typically NOT available?

When working with an Aux Input in Pro Tools, the primary function is to process audio signals rather than record them directly onto a track. An Aux Input is designed to bring in audio from various sources and manipulate that audio through effects and routing but it does not have the capability to record live performances like a standard audio track would.

In contrast, the other features associated with Aux Inputs are standard and expected functionalities. Sending audio to different speakers allows control over playback monitoring. Creating an auxiliary send facilitates the use of effects processing like reverb or delay, allowing one to apply those effects to multiple tracks without having to duplicate them for each track. Lastly, routing audio from multiple sources is a core function of Aux Inputs, enabling the combination and processing of signals from different tracks or instruments. This versatility makes Aux Inputs essential in mixing environments, but the inability to record directly distinguishes their primary function from standard audio tracks.