EXS24 mkII output parameters define the level—the perceived volume—of a played note. The change in level over time is controlled by an envelope generator, ENV 2.
ENV 2 is hard-wired to the dynamic stage of EXS24 mkII—it is always used to control the level of each note. See EXS24 mkII envelope overview.
Level via Vel slider: Determine how velocity affects the volume of the sound. The upper slider half determines the volume when the keyboard is struck at maximum velocity, and the lower half determines the volume when the keyboard is struck at minimum velocity. Drag the area between the two slider segments to move both simultaneously.
Volume knob: Set the output level of EXS24 mkII. Adjust to find the balance between no distortion and getting the best—the highest—resolution in the channel strip and the Level via Vel slider.
Key Scale field: Modulate the sampler instrument level by note number—the position on the keyboard. Negative values increase the level of lower notes. Positive values increase the level of higher notes. This is useful when you are emulating a number of acoustic instruments, where higher-pitched notes are often louder than low notes.