Sackbut eighteenth century; when it returned, the Italian term "trombone" became dominant. In modern English, an older trombone or its replica is called a sackbut. An older instrument generally differs from modern trombones by its smaller, more cylindrically-proportioned bore, and its less-flared bell. The bell section was more resonant (since it did not contain the tuning slide and was loosely stayed rather than firmly braced to itself). These traits produce a "covered, blended sound which was a timbre particularly effective for working with voices... zincks and crumhorns", as in an alta capella. The revived instrument had changed in specific ways. In
Sackbut don't have water keys, stockings, a leadpipe, or a slide lock, but as these parts are not critical to sound, replicas may include them. Bore size remained variable, as it still is today. The first reference to a slide instrument was probably "trompette des ménestrels", first found in Burgundy in the 1420s and later in other regions of Europe. The name distinguished the instrument from the "trompettes de guerre" (war trumpets), which were of fixed length. The next word to appear in the 15th century that implied a slide was the "sackbut" group of words. There are two theories for