You can use this application in one of two modes: simple interval or circular.
Simple Interval joins with a line the two notes that form the selected interval:
A geometric figure is created using the selected interval. The figure shows the notes needed to do a complete cycle and return to the first note using the interval. For example, if you choose major third the notes will be C - E - G#/Ab - C:
1. Select mode:
2. Select the Interval:
3. Select the lowest note:
Major Third, 4 semitones