arduino volume control

hi, i'm currently working on a university project using arduino.

i'm using n MP3 trigger with a lilypad and cant manage to get any sort of coding to work with the combination.

the objective is to to control the volume of the mp3 tracks through using custom made stretch sensors, which work just like variable resistors.

if anyone can offer some advice it would be greatly appreciated!

thanks

Best advice is to post a link to what MP3 device you are using, describe how you have it wired up to the arduino or better still a diagram. Then post what you have tried so far (use the # icon please), and give us something to go on.