I have a Macbook mid 2009 running Yosemite. I have a jack from some old headphones stuck and broken inside the audio output. Impossible to remove from the outside. As a result, the speakers are always muted and i can't connect any external speakers because of the broken jack. I am almost certain that I could choose to have sound from both internal speakers and audio out at the same time on my old windows computers, but how do i manage this in OSX? Another solution could be to "turn off" the audio out, but i don't know if that is possible. Anyone got a good solution?