title: Transparent faces for violinplots in seaborn
body: <p>Extending <a href="https://stackoverflow.com/questions/62597959/seaborn-violinplot-transparency">this question</a>, is there a way to control the transparency of a face of the violinplot without affecting the edge?</p>
  <p>When accessing the collection this results only in a reduction in overall alpha (here with increasing transparency taken from the original question):</p>
  <p><a href="https://i.stack.imgur.com/2K1G9.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/2K1G9.png" alt="enter image description here" /></a></p>