A sampler is a sound generating module that reduces rich sound waves in a variety of amplitudes. This doesn't make sense
A sampler is a sound generating technique that combines a rich sound sound and one or more filters to create a new color. This is the definition of subtractive synthesis.
A sampler is a sound generating module that can play back samples. Excellent!
A sampler is a sound generating module that combines waves in a variety of amplitudes, frequencies, and phases. This is the definition of additive synthesis