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Figure 5.1 Click on thumbnail for full size image. |
Figure 5.1 shows what happens when the Sound box containing the Harmonic just updated is selected. The bottom left shows the properties for a Sound box. Graphs can be input for determining what happens to the volume and pitch during the duration of the sound. The duration of the sound can be a fixed value, e.g. 2 secs, or can be proportional to the current volume. The idea of making the duration proportional to the volume is a little like the difference between hitting a note on a piano lightly, or heavily, when the note is likely to last for longer. Under the proportional-to-volume mode, the value in the duration box is used as a factor, rather than an absolute time.
The 'Volume graph from zero' checkbox, which is ticked by default, means that the Volume graph starts at zero, and rises to a maximum of the current volume + volume extent. Current volume is determined from the initial volume, set on the Sequence box property, and adjustments to volume, set on Interval and Repetition Group properties. If this box is un-checked, it means that the volume starts off at the current volume, and can deviate from this current volume by a maximum of volume extent. Pitch changes are always dealt with in this way, ie using fluctuations from the current pitch.
Pitch calc freq is used to set the pitch calculation frequency to a value less than the general calculation frequency (which is a configuration parameter). Experimenting with this parameter can produce some interesting effects.
The 'Scale-to-fit' checkboxes indicate whether the corresponding graphs should be stretched/shrunk to the duration of the sound, or whether they should be used without stretching/shrinking, in which case a graph that has an x-axis limit of 2 would last for no longer or shorter than 2 seconds. If the duration of the sound was less than 2 seconds, not all the graph would be used. If the duration was greater than 2 seconds, the graph would cease to have an effect after the 2 seconds was up.
The 'Invert' checkboxes invert the corresponding graphs about the y-axis, so for a graph that normally rises from left to right, ticking inverted would make it fall from left to right, and vice versa.