Sounds are MISSING from my Mash-UP?

[MattSTEFF]

Ableton Saviors,

I put together a mash-up in Ableton. Everything worked great, exported it to Itunes, sounds wonderful. However, when I play it on the sound system at the studio (from the computer, 1/8" into the headphone jack) there is a guitar piece missing. Play it back on my computer, guitar riff is there!

I've tried it on two sound systems now with the same results, and yet, it's there everytime when I play it in itunes through the computer speakers. Could this be something in the way I rendered it? OR is it mash up ghosts?

Thank you much for your input!
Matt

[wombcorps]

must have been how you rendered it - render it again and make sure all channels you want to hear in the render are activated. then, check through the rendering options to make sure everything is in check