ere it is possible to modulate the
        <code>HOP-SIZE</code> using the mouse:
      </p>

      <pre class="src src-lisp">(<span style="color: #8deeee;">dsp!</span> <span style="color: #87cefa;">hop-size-mod</span> ((size fixnum) amp)
  (with ((fft (make-fft size))
         (abuf (make-abuffer fft))
         (ifft (make-ifft size)))
    (setf (fft-input fft) (sine 440 .5 0))
    (with-control-period ((sample-&gt;fixnum (lag (lin-mouse-x 150 10000) .02)))
      (compute-ifft ifft abuf))
    (stereo (* am