Play/pause Audio - Edge Commons, variables???

Hi

So i have a comp playing sound using edge commons, when button clicks i call

EC.Sound.play("autum");

but i want to click the button again and for it to pause, so i think i need to set up a variable?

heres my code,

var onOff = 0;

if (sym.getCompostion().getStage().getSymbol('autum').onOff == 0){

          sym.getCompostion().getStage().getSymbol('autum').onOff = 1;

          sym.getCompostion().getStage().getSymbol('autum').EC.Sound.play;

}

else {

          sym.getCompostion().getStage().getSymbol('autum').onOff = 0;

          sym.getCompostion().getStage().getSymbol('autum').EC.Sound.play;

}

any ideas where i'm going wrong? has anyone done this with Edge Commons or Buzz.js or Edge Hero?

Ta