What is the purpose of the editing lines in the sampler?

The editing lines in a sampler play a crucial role in determining how a sound sample is manipulated and shaped during playback. The bottom editing line is utilized to define the start and end points of the audio sample, allowing users to select specific sections of the audio they wish to utilize. This control is essential for isolating desirable sound segments and ensuring that only the intended part of the sample is triggered when played.

The top editing line serves the function of applying fade-in and fade-out effects. This feature helps in crafting a smoother beginning and ending to the sound playback, allowing for more polished and professional-sounding audio. By fading the sound in or out, users can prevent abrupt starts or stops that might otherwise distract from the listening experience.

Together, these editing lines allow for precise control over the sound sample's introduction and conclusion, making option B the accurate choice in understanding their purpose in a sampler.