5/1/2021 0 Comments Drawbar Settings Handbook
Although I agree with Schnellbechers sentiments above, this suffers from the same flaw (not considering the logarithmic nature of the drawbar settings) as Irwins suggestion.The first two are pretty much self-explanatory, and wont be discussed here.
Two tones can be of the same volume and pitch but still sound radically different (imagine the same note played on a trumpet and a xylophone). Most tones consist of a fundamental, together with several harmonics present in varying degrees. The frequency of the fundamental is what we usually perceive as the tones pitch. The purest tone consists of only a fundamental, and looks and sounds like this. Instead of hearing the harmonics as distinct tones, our ears and brain hear a tone of the fundamental frequency, but with a different character than the pure tone. For example, here is a tone with the same pitch as the sample above, but consisting of the fundamental with a bit of the third harmonic (3x the fundamental frequency) and a bit less of the fifth harmonic (5x the fundamental frequency) thrown in. There are nine drawbars for setting the levels of the fundamental and various harmonics and sub-harmonics (lower in frequency than the fundamental). Zero means off; the harmonic controlled by that drawbar will not appear in the generated tones. The remaining positions will cause the specified harmonic to appear in varying amounts, with each increment producing about a 3dB increase. For example, a possible drawbar setting sounding like an 8 Tibia stop is 00 8040 000. When an organist selects a single stop on a pipe organ, the resulting tone will be a complex one with many harmonics. The complexity of the tone depends on the type and number of ranks of pipes that the stop controls. A stop controlling a single rank of flute pipe will produce almost pure tones, whereas one controlling two ranks of diapason pipes will produce tones rich in harmonics. Sometimes the imitation will be almost perfect (when all the harmonics produced by the pipe stop are also ones available via the drawbars), and sometimes less so (such as a stop that contains a significant amount of 7th harmonic). Some stops are quite boring when played in isolation, so other stops are added to change the character of the resulting sound. Registrations can be set up manually by pulling the desired stops, or by means of pre-programmed combination pistons which can activate a handful of stops at once. Drawbar Settings Handbook Registration Is AlsoSo like a simple stop, an entire registration is also a drawbar setting. Mathematical analysis based on the physics of sound and the workings of the Hammond organ show some of them to be misconceived. Following this rule means that 81 and 88 both give 8, whereas the latter should clearly be louder. Furthemore, adding too many drawbar settings together will always yield 88 8888 888.
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