Adjustments in the strength and shape of the embouchure change the tone and intonation tuning. It is not rare for clarinetists to employ one of the simplest ways to relieve the force on the higher teeth and inner lower lip by attaching pads to the tip of the mouthpiece or inserting transient padding on front lower teeth, commonly from folded paper. Next is the short barrel; this part of the device may be extended to fine tune the clarinet. As the pitch of the clarinet within reason temperature smooth, some
contraptions have interchangeable barrels
whose lengths vary a bit. Additional compensation for pitch variation and tuning can be made by pulling out the barrel and thus increasing the tool's length, in particular common in group gambling in which clarinets are tuned to other instruments paying homage to in an orchestra or live performance band. Some performers use a plastic barrel with a thumbwheel that adjusts the barrel length. On basset horns and lower clarinets, the barrel is invariably replaced by a curved metal neck. The main body of most clarinets is split into the higher joint, the holes and most keys of that are operated by the left hand, and the lower joint with holes and most keys operated by the proper hand. Some clarinets have a single joint: on some basset horns and greater clarinets the two joints are held together with a screw clamp and will not be disassembled for garage. The left thumb operates both a tone hole and the sign in key. On some models of clarinet, reminiscent of many Albert system clarinets and more and more some higher end Boehm system clarinets, the sign in key is a 'wraparound' key, with the important thing on the back of the clarinet and the pad on the front.