Which tool is used to adjust a selected clip's gain in Pro Tools?

The gain of a selected clip in Pro Tools is adjusted using the Gain plug-in. This tool is specifically designed to modify the gain level of audio clips non-destructively, which allows for precise control over the clip’s volume without affecting the original audio file. The Gain plug-in can be accessed directly on the clip in the clip list or by inserting it onto an audio track.

By utilizing the Gain plug-in, users can increase or decrease the overall level of the audio signal, making it essential for setting levels before mixing or after recording. This capability helps to bring quieter clips up to an appropriate level or to prevent clipping on louder clips without altering the actual recorded audio.

In contrast, the Trim tool is mainly for adjusting the in and out points of audio clips, the Standard Volume fader controls the overall output of an entire track rather than individual clips, and the Smart tool combines several functions for editing and handling clips, but it does not specifically adjust clip gain in a targeted manner like the Gain plug-in does.