The signature of a traditionally-structured trombone is the use of a slide rather than a row of valves to produce different notes. However, many trombone players add valve attachments to their instruments so that they end up with a hybrid of both. The musician presses the valves while still using the slide, which allows for both an extension of musical range and alternate slide positions that may help play specific note transitions easier.  There is also a type of trombone called a valve trombone, which retains the shape and amount of tubing of a traditional trombone so the sound is the same but has a row of valves on its top that the player uses like a trumpet’s. This allows for faster playing than a slide or slide and valve combination, although the sound quality can be said to be muffled compared to the alternative.