</ul>

      <p>
        For example:
      </p>

      <pre class="src src-lisp"><span class="prompt">SCRATCH&gt;</span> (edit-envelope env1 <span style="color: #b0c4de;">:adsr</span> '(.15 .09 .85 1.5))
#&lt;ENVELOPE <span style="color: #b0c4de;">:POINTS</span> 4 <span style="color: #b0c4de;">:LOOP-NODE</span> -1 <span style="color: #b0c4de;">:RELEASE-NODE</span> 2&gt;
<span class="prompt">SCRATCH&gt;</span> (mapcar (<span style="color: #8deeee;">lambda</span> (point) (envelope-level env1 point)) '(0 1 2 