You can add a globular component near the beginning of a tubular instrument to lower its pitch, or add one near the end to alter the instrument's tone. Widening or narrowing the bore of a tubular instrument has little effect on pitch. Widening or narrowing the neck of a globular instrument has a significant effect on pitch. With tubular instruments, pitch is affected by the size of toneholes and their distance from the end of the tube. With globular instruments, pitch is affected by the size of toneholes but not their location.
Flexible membranes can alter aerophone characteristics and reinforce fundamental pitches.
They can also provide additional sound-producing mechanisms in the style of mirlitons. And thanks to EMI, its readers, Dr. Elizabeth Hall, Richard Smith, Geoff Brown, Dr. Guy Grant and the internet didjeridu community for inspiration and encouragement. An interesting and fun technique that can be used when playing globular horns with resonating membranes is the buzz technique. It's very simplewhen blowing into the horn, lightly touch your finger, fingernail, or another object to the surface of the vibrating membrane. Depending upon the object, where you touch it to the membrane and how hard you press it against the membrane, you can achieve a variety of loud gritty buzzing effects.