Which suffix implies a meaning of "little" or "less" in musical terminology?

The suffixes "--ino" and "--etto" both suggest a meaning of "little" or "less" in musical terminology. They are often used to denote a smaller or diminished version of a musical term. For example, "piano" means soft, while "pianissimo" with the suffix "--issimo" means very soft; however, "pianino" indicates a softened or smaller representation of the concept of soft in music. Similarly, "quartetto" refers to a small group of four performers, deriving from "quattro," which means four, and suggests a lesser or more intimate size compared to a full quartet.

While "--issimo" implies an increase or intensity (as seen in terms like "fortissimo," meaning very loud), it does not convey the idea of "little" or "less." The question specifically asks for a suffix indicating a diminutive form, which both "--ino" and "--etto" accomplish, hence making the choice highlighting both of them the correct response.