Description EchoJack is an audio utility that lets you play through audio from any
input device to any output device. EchoJack can be used to do the following:
- Monitor the audio recording using headphones.
- Create a makeshift Public Announcement (PA) system. Simply hook up your
mac’s line-out to an amplifier, turn on EchoJack, and speak into your mac’s
microphone. Your sound will play through to the amplifier.
- Add voice comment during media playback. Simply turn on EchoJack when
playing audio/video media, and speak into your mac’s microphone. Your voice
will be mixed into the media output sound.