Install tragic lantern

Tragic lantern audio shutter instruction video

version: tragiclantern-v31337.TRAGIC.2014Jul30.EOSM202.zip

Install mpg123 or gst123

sudo apt-get install mpg123 (ubuntu 12.04)
sudo apt-get install gst123 (ubuntu 14.04

download an audio / beep.mp3 file

any file that makes a loud noise in mp3 format

wiring

computer out: Generic sound connector
camera in: Headset (microphone) connector

Wiring to reduce line out power to in line levels

(http://electronics.stackexchange.com/questions/60949/connect-speaker-output-to-microphone-input)