Octava SD4 is a complex and powerful application whichy helps you compose music. The program offers the possibility to:Mark the parts of your composition and enter different specifications like melody-lines, chord progressions, orchestrations - as well as to let execute and apply the composition rules technology onto the drawing selection of your composition automatically. It is recommendable to input additional-melodies. The program then supplements desired filling-voices, in accordance with the chosen voice-leadership rules.Octava will than calculate a hundred - tousands possibillites like one most modern and best chess programm and choose the best solutions.If the melody-line is less important, like for example with accompaniment -compositions, can be abstained on the specification of a melody. The demands of the composing-automation come again after the general principle of "Mark and edit ." However, statements about the chord progression entered with the Chord- palette should become before. It is necessarily to enter the statement of a one scale at least.If an area is marked, so a composition rule can be clicked on (tool bar "Compose") and Octava will supplement the desired filling voices.With the block-selection, it is to be heeded that just as many voices are marked, as is declared in the chosen composition rule.Furthermore, already pre-determined melodies as well as notes or rests in the block must be included in block selection , if they should be taken into account from the composition - rules.Example: the prohibition of paralel fifths pretended in the compopsition rule can be taken into account only with reference to one existing bass if this is included in the block as well.On the other hand it is valid in principle that already pre-determined notes and rests are not changed even if they contravene against the chosen composition rule.Notes and rests must be deleted before a composition rule is placed completely again!Before you apply a composition rule, you can drive rhythmic, pitch position and some composition rules like dissonance-planning.