defined in different voices with the <mark>unpitched</mark> command.<br/>
    The command indicates the instrument type and where, graphically, the elements should be rendered (pitch and octave).<br/>
    For example the following code <code>(unpitched "acousticbassdrum" "C" 4)</code> indicates that in the current voice all unpitched notes from now on are <em>Acoustic Bass Drum</em> rendered as <code>^4 c</code> 
</p>

<p>Unpitched notes are represented with the lower letter <code>x</code> or <code>o</code>