I'm having issues with an MP3 sampler I've created. What is the appropriate
actionscript to get it to play the MP3 i've sourced, automatically, when the
timeline arrives at the keyframe. I'm using 'loadsound' and saying false after
i write the source but it still doesn't work.

Thanks ahead of time to whoever knows this...

if you want the sound to auto start, use
beat.loadSound("beat.mp3", true); // streaming sound

if using - beat.loadSound("beat.mp3", false); // completely loads before play
for autostart, add code to the frame - beat.start();

checkout the Sound Object in the Reference, and this link for more -
http://www.kennybellew.com/