Operation Manual

6.90 Tube 149
Amplitude of the tube resonances
The amplitude of the resonances can be adjusted with the radius of the tube when it is open at
the listening point. At the extremity of a tube sound energy is radiated toward the exterior, the
termination in fact acting like a low-pass filter. Increasing the radius of the tube, both increases the
amount of energy radiated (thereby decreasing the amplitude of the tube resonances) and lowers
the cutoff frequency of the filtering effect of the termination. In other words, you can obtain very
strong resonances and long decay time by using tubes of small radii. Note that changing the radius
of a tube has no effect when a closed termination is used. The decay time in the tube can also be
adjusted with the decay knob on the module front panel.
Typical Use
The Tube module can be used to introduce delay in a patch. Tubes can also be used as sympathetic
resonators as illustrated in Figure 62. In this example the output of a String module is sent into an
array of three tubes each having a different length. The tubes enhance certain notes depending on
their resonance frequencies.
Figure 91: Sympathetic tubes.
The default values of the following parameters is set at construction
• length: length, in meters, of the tube (between 0.01 and 1000m).
• radius: radius, in meters, of the tube (between 0.001 and 1 m).
• termination: specifies whether the tube is open or closed at its extremity. A value of 0
indicates that the tube is closed and a value of 1 that it is open.
Note: See also Tube4 and Tube Reverb.