Figure 18.1 shows an interval numerator and denominator (Interval Numer and Interval Denom fields) representing the fraction 2/3 being entered. This will have the effect of reducing all immediate (i.e., non-nested) intervals of the Chord Group to 2/3 of their previous values.

The spinners, shown immediately to the right of numeric fields in the Properties pane, can be used to adjust the interval numerator and demoninator. Spinners were introduced in version 3.2.0 of the software.

After clicking Compute, here is the new generated sound: