<a name="blackNoteLength"><h3 style="padding-top: 40px; margin-top: 40px;"></h3></a>
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**blackNoteLength(num)** Sets the size of a black key in proportion to the white. 

<!--UPDATE WIDGET_IN_CSOUND
    SIdent sprintf "fontSize(%d) ", rnd(20)
    SIdentifier strcat SIdentifier, SIdent  
-->