Sound gauge - LUA script

[Karmat]

Hello,

I need help with a problem since a week with a sound gauge (lua script).
In the 3D cockpit, on a fire test button, when I stay pressed with the left mouse button, the sound plays in a loop when I would like it to play only once, even if I stay pressed on the left button and release it.

In the xml file of the model :

  <PartInfo>
    <Name>custom_rec_Event_43</Name>
    <MouseRect>
      <Cursor>Hand</Cursor>
      <MouseFlags>LeftRelease+LeftSingle</MouseFlags>
      <CallbackCode>
        (M:Event) 'LeftSingle'  scmi 0 == if{ 1 (&gt;L:fire test button,bool) || }
        (M:Event) 'LeftRelease'  scmi 0 == if{ 0 (&gt;L:fire test button,bool) }
      </CallbackCode>
    </MouseRect>
  </PartInfo>

In the xml file of the gauge sounds :

<SimBase.Document Type="AceXML" version="1,0" id="radar_settings">
    <Descr>AceXML Document</Descr>
    <Filename>bk117sounds.xml</Filename>
    <SimGauge.Gauge id="Gauge">
        <FloatPosition>0.000,0.000</FloatPosition>
        <Size>10,10</Size>
          
        <Update id="Update">
            <Script>!lua

            --buttonPressRelease
            if varget("L:fire test button", "bool") ~= varget("L:sound_38", "bool") then
                soundOneShot("gong.wav")
            end
            if varget("L:fire test button", "bool") ~= varget("L:sound_38", "bool") then
                varset("L:sound_38", "bool", varget("L:fire test button", "bool"))
            end
            --
        
            </Script>
        </Update>

    </SimGauge.Gauge>
</SimBase.Document>

If you would be so kind as to help me.

Karmat