I'm having trouble figuring out how to mute the sound with a button. Here's the CONTROL object that currently handles the sound:

onClipEvent(load)
{
_root.soundstatus="on";
_root.mySound = new Sound(_level0);
_root.mySound2 = new Sound(_level1);
_root.mySound3 = new Sound(_level2);
_root.mySound4 = new Sound(_level3);
_root.mySound5 = new Sound(_level4);
maxvolume=100;
minvolume=0;
}

onClipEvent(enterFrame)
{
if(_root.soundstatus=="on") {step=5}
if(_root.soundstatus=="off") {step=-5}

maxvolume+=step;

if (maxvolume>100) {maxvolume=100;}
if (maxvolume<0) {maxvolume=0;}

_root.mySound.setVolume(maxvolume);
_root.mySound2.setVolume(maxvolume);
_root.mySound3.setVolume(maxvolume);
_root.mySound4.setVolume(maxvolume);
_root.mySound5.setVolume(maxvolume);
}