How can I play a sound only the first time I view a scene?

You need to set a variable for each scene in the onstart-event of the scene:

onstart="sound_scene_1();"

<action name="sound_scene_1">
if(scene_sound_1 !== 1,playsound(...the sounddfile you want to play...);set(scene_sound_1,1));
</action>

And this for every scene. You could it also automate for each scene, but that would need a little coding-experience on your site ;-))

I would try something like:
Action cow..
scn= xml.scene;

If(!scn.soundplayed, playsound(blablatomato);
scn.soundplayed = true;
);

blablatomato could be the scenes audiotit="%VIEWER%/sounds/scene_14".mp3.. etc see https://krpano.com/plugins/soundinterface/#playsound

Not to forget to call the cow action onnewscene(!)

.. but i've been playing balls and beers tonight so i might be wrong..

..EDIT:
I was wrong..

this should work when you call te sounds 'scene_1.mp3 etc..:

<events name="dosound" keep="true" onnewscene="DoSound();" /> 
	<action name="DoSound">
		tween(plugin[soundinterface].volume, 0,1,,stopallsounds();
			snd = '%VIEWER%/sounds/' + xml.scene +'.mp3';
			sp = *scene[*xml.scene].played;
			if(!sp,
				playsound(scsound,*snd);
				tween(plugin[soundinterface].volume, 1);
				scene[*xml.scene].played = true; 
			);
		);
	</action>
	
	<plugin name="soundinterface" keep="true"
			url="%VIEWER%/plugins/soundinterface.js"
			preload="true"
			rootpath=""
			volume="1.0"
			mute="false"
			panningmodel="simple"
			worldscale="1.0"
			autopause="true"
			autounlock="true"
			/>

Hope it helps,

Tuur

Now that´s what I call elegant!

I use something very similar to check automatically which sounds should be played for each scene. But your version is way more efficient

Hi Nupsi,

thanks for the compliment!

Tuur