Figures 20.1 and 20.2 show a Repetition Group box being selected. The upper properties of the Repetition Group are shown in Figure 20.1, and the lower properties in Figure 20.2.

The No of reps field is the number of repetitions of other boxes that are enclosed by the Repetition Group. Here it is a Chord Group that is being repeated. The default number of repetitions (1) will play whatever is in the Repetition Group box once, a value of 2 would play it twice and so on.

The Repetition Group properties allow you to specify the interval between repetitions of the children — excluding nested children here — of the Repetition Group. If the Interval relative to field is set to to Previous sound, it means that the interval is relative to the start of the latest (i.e., furthest from time zero) sound of the previous repetition. It is also possible to have the interval relative to Previous, meaning each repetition is relative to the start of the previous repetition. The interval can be specified as a constant, by entering a value (in seconds) in the Interval duration edit field, or as a graph, yielding changing values with each successive repetition, by entering values in the Duration/Interval graph and Duration/Interval ext. fields and checking the Interval graph checkbox.

A value of Previous sound for the Pitch relative to and Vol relative to fields means that the pitch or volume is computed relative to the last (i.e., rightmost) child of the Repetition Group, which is not necessarily the latest (i.e., furthest from time zero); sometimes a technique of inserting a dummy sound of zero duration as the last component of the last Chord Group embedded within the Repetition Group can be useful to get the effect you want. Pitch and volume changes can be specified using constant factors by entering values in the Rel. Pitch Numer and Rel. Pitch Denom fields for pitch or Rel. Volume and Vol operator fields for volume; or can be specified by graphs, yielding changing values with each repetition, by entering values in the Pitch ext., Pitch graph, Vol. ext. and Volume graph fields.

The intervals and durations of the nested children (i.e., children of children, children of children of children etc.) can be controlled with graphs using the fields Duration/Interval ext., Duration/Interval graph, Child interval ext., Child interval graph (checkbox and field), Child duration ext. and Child duration graph (checkbox and field). To control the interval between nested children, check the Child interval graph checkbox, and enter values in the Child interval ext. and Child interval graph fields. As an alternative, you can leave the Child interval graph field blank in which case the Duration/Interval graph would be used, or leave the Child interval ext. field at 0 (zero) in which case the Duration/Interval ext. would be used (this is to allow the Interval graph to be shared between nested child intervals also). In a similar way, to control the durations of nested children check the Child duration graph checkbox and enter values in the Child duration ext. and Child duration graph fields; alternatively, leave them zero/blank in which case the values in the Duration/Interval ext. and Duration/Interval graph fields would be used.

You may have noticed that the look-and-feel has changed: earlier pages of this tutorial showed the Metal look-and-feel, whereas here we have switched to the Windows look-and-feel. You can change look-and-feel from the Configure >> Other parameters menu option.