<p><pre><code>  I would bet money that Amazon ran into this same
  conundrum with the unconstrained VBR mode of the
  LAME MP3 encoder which they use.
</code></pre>
Lame has always had a way to set minimum and maximum bounds on the VBR bit rates. I would bet that Amazon has at least one employee who knows this. I used to use this a lot with a hardware player that couldn&#x27;t handle VBR above 224 kbps.