Can't mute/unmute swf audio using Flash Command action

Please help me figure out why Lectora won't mute/unmute a swf I created with the following AS3. I've tested this code and it will mute/unmute the audio when called within the swf itself:

var st:SoundTransform = SoundMixer.soundTransform;

var muteFlashAudio = "0";

addEventListener(Event.ENTER_FRAME, toggleAudio);

function toggleAudio(event:Event) {

if (muteFlashAudio == "1"){ //if mute toggled on, zero volume

st.volume = 0;

SoundMixer.soundTransform = st;

}

else if (muteFlashAudio == "0"){ //else audio at full volume

st.volume = 1;

SoundMixer.soundTransform = st;

}

}[/CODE]

However in Lectora nothing happens when a button is clicked with the following action:

On: Mouse Click

Action: Flash Command

Target: (my swf)

Command: Set Variable

Name: muteFlashAudio

Value: 1

Originally I tried using "Call Function", but I read on the forums that is unreliable. So I switched to "Set Variable" and adjusted the code (still works as a stand alone swf). Other Flash commands work on the swf (pause/play, etc). Of course, I am testing after publishing to HTML. This doesn't work in any browser I try.

What am I missing?[CODE]var st:SoundTransform = SoundMixer.soundTransform;

var muteFlashAudio = "0";

addEventListener(Event.ENTER_FRAME, toggleAudio);

function toggleAudio(event:Event) {

if (muteFlashAudio == "1"){ //if mute toggled on, zero volume

st.volume = 0;

SoundMixer.soundTransform = st;

}

else if (muteFlashAudio == "0"){ //else audio at full volume

st.volume = 1;

SoundMixer.soundTransform = st;

}

}[/CODE]

However in Lectora nothing happens when a button is clicked with the following action:

On: Mouse Click

Action: Flash Command

Target: (my swf)

Command: Set Variable

Name: muteFlashAudio

Value: 1

Originally I tried using "Call Function", but I read on the forums that is unreliable. So I switched to "Set Variable" and adjusted the code (still works as a stand alone swf). Other Flash commands work on the swf (pause/play, etc). Of course, I am testing after publishing to HTML. This doesn't work in any browser I try.

What am I missing?