How can I set output to internal speakers after I've set the 3.5mm jack as input on 13" MacBook Pro?
Have a look at the free
LineIn
Inside The Lines
LineIn is a simple application for OS X to enable the soft playthru of audio from input devices. In simpler terms, you can use LineIn to play sound coming in through a microphone or any other device plugged in to your Sound In port, just as was once available with OS 9's &quot;Play input through output device&quot; option.