title: System default voice doesn't change on `say` command within tmux sessions
body: <p>Recently I've changed my default system voice via "System Preferences > Dictation &amp; Speech > Text to Speech > System Voice". If I open a new Terminal window and use the <code>say</code> command, the correct voice is used. However, the previous voice is still used if I use the <code>say</code> command within a tmux session.</p>
  
  <p>I've tried restarting, shutting down tmux completely, and opening an entirely new tmux session with <code>tmux new-session -s foobar</code> and still it doesn't pick up the new preferred voice.</p>
  
  <p>This is really a minor issue, but it eats at me that I have no idea why it's happening. Any ideas? </p>