When comping vocal takes, what technique helps to smooth transitions between different takes to prevent noticeable shifts in timbre or ambience?

When comping vocal takes, crossfading is a key technique that helps to smooth transitions between different takes and prevent noticeable shifts in timbre or ambience. Comping involves combining the best parts of multiple vocal performances into a single, seamless track. However, simply cutting and pasting different takes together can often result in abrupt changes in the vocal's tone, volume, or the amount of room ambience capt....