When I change from one panorama to another appears 1 second of audio, how can I fix this?

You can see the problem here:

http://studio360.com.ar/ultrapetrolvirtual/ultrapetrol.html


Here´s the code:
<?xml version="1.0" encoding="UTF-8"?>
<!-- for xml compliance -->
<krpano version="1.0.8.14">
<!-- acciones a realizar al cargar -->
<events onxmlcomplete="onxmlcompleteaction();"/>
<action name="onxmlcompleteaction">
panotourmapsunactivespots();
plugin[combobox].selectitem('Rampa Varadero Final');
panotourmapsactivespot(panotourmapsspot7);
</action>
<action name="playpanosounds">
playbackgroundsound(none);
</action>
<action name="stoppanosounds">
stopbackgroundsound();
</action>
<action name="closepanoobjects"></action>
<!--************** Panorama *******************************************************************-->
<!-- @File="ultrapetrol11.xml" @PanoName="Rampa Varadero Final" @FilePath="/Users/hernanespana/Desktop/ultrapetrol/C[Group 6]-HER_7951_HER_7957-7 images.jpg" -->
<panoview h="-13.29" v="3.21" fov="41.82"/>
<!-- parámetros de visualización -->
<view fisheye="0" limitview="range" hlookatmin="-170" hlookatmax="40" vlookatmin="-90.005" vlookatmax="73.8824" maxpixelzoom="1.0" fovmax="90" fov="41.82" hlookat="-13.29" vlookat="3.21"/>
<progress showwait="none"/>
<autorotate horizon="3.21" tofov="41.82" waittime="1" speed="5"/>
<!-- vista previa -->
<preview url="ultrapetroldata/ultrapetrol11/preview.jpg"/>
<!-- el panorama mismo -->
<image type="SPHERE" hfov="360" vfov="175.19" voffset="-2.41" multires="true" tilesize="609" baseindex="0">
<level tiledimagewidth="5000" tiledimageheight="2433">
<sphere url="ultrapetroldata/ultrapetrol11/2/%v_%u.jpg"/>
</level>
<level tiledimagewidth="2500" tiledimageheight="1216">
<sphere url="ultrapetroldata/ultrapetrol11/1/%v_%u.jpg"/>
</level>
<level tiledimagewidth="1250" tiledimageheight="608">
<sphere url="ultrapetroldata/ultrapetrol11/0/%v_%u.jpg"/>
</level>
</image>
<!--************** Puntos clave y reflexiones *************************************************-->
<hotspot name="spot19" hview="-54" vview="0" fovview="90" hcenter="18.0286" vcenter="-0.119935" onclick="mainloadpano(ultrapetrol7.xml);lookat(get(hview),get(vview),get(fovview));" url="ultrapetroldata/graphics/spots/spot1.png" crop="0|0|65|65" frame="0" lastframe="9" frameheight="65" framewidth="65" onloaded="set(stopSequence,false);animate(spot19,0.1);" onhover="showtext('Entrada Planta de Chapas');" ath="378.029" atv="-0.119935"/>
<hotspot name="spot20" onclick="closeglobalobjects();closeallobjects();set(plugin[spot20object].visible,true);tween(plugin[spot20object].alpha, 1);plugin[spot20object].play()" url="ultrapetroldata/graphics/spots/spot2.png" crop="0|0|65|65" frame="0" lastframe="9" frameheight="65" framewidth="65" onloaded="set(stopSequence,false);animate(spot20,0.1);" ath="333.386" atv="11.3304"/>
<plugin name="spot20object" visible="false" url="ultrapetroldata/graphics/videoplayer.swf" videourl="ultrapetroldata/graphics/spots/object9.flv" pausedonstart="true" align="center" alpha="0" onclick="closeglobalobjects();tween(alpha, 0);delayedcall(0.5,set(visible,false));stop();" width="700" height="500"/>
<action name="hidepanospotsaction">
set(hotspot[spot19].visible, false);
set(hotspot[spot20].visible, false);</action>
<action name="showpanospotsaction">
set(hotspot[spot19].visible, true);
set(hotspot[spot20].visible, true);</action>
<!-- cerrar todos los puntos clave -->
<action name="closeallobjects">set(plugin[spot20object].alpha, 0);set(plugin[spot20object].visible,false);plugin[spot20object].stop()</action>
</krpano>

Thanks to all!

Best Regards

H.

Hi Klaus and sachagriffin, thanks for your attention! The problem was well described by sachagriffin. Listen when switch from one pano to another you can hear the sound of the video starting for one second. I need to solve this, hope someone can help me.
Thanks!

I have changed te videoplayer.swf file and now the tour is working properly!
Klaus,sachagriffin and jschrader, thank you very much for your help and attention resolving this topic.
My best regards
Hernan