The "rule of thumb" is that the more pressure against
the reed (often from metal ligatures) the better the
response. Conversely, the looser the pressure, allowing
the bottom of the reed to vibrate more, the more "dark"
the tone. The Rovner ligature uses less pressure against
the reed due to its "strap" construction. Two models are
available: "dark," and "light," each influencing the tone differently. Classical performers most often prefer the "dark" model for its
warm and centered sound. Jazz performers often like
the "light" model for its broad, open tone,
somewhat brighter sound.