 curve the envelope up and down, defaults to -4.
        </li>
    </ul>





</dd>
    <dt>
    <a name = "new_ar"></a>
    <strong>new_ar (x_min, x_max, y_min, y_max, attack, release, level, curve)</strong>
    </dt>
    <dd>
    Create a new AR (Perc) EnvGraph object.
 All arguments optional.


    <h3>Parameters:</h3>
    <ul>
        <li><span class="parameter">x_min</span>
         Minimum value for x axis, defaults to 0.
        </li>
        <li><span class="parameter">x_max</span>
         Maximum 