Get / Set render chime setting. You can use the get function to check whether it is enabled or not. Use the set function to set it to a new state.

renderChimeState.jsx

function getRenderChimeState  () {
    try {
      return app.preferences.getPrefAsLong(
        "Misc Section",
        "Play sound when render finishes",
        PREFType.PREF_Type_MACHINE_INDEPENDENT
      );
    } catch (e) {
      // something went wrong, maybe print or alert the error
      return
    }
    return true;
  };

//////////////////////////////////////////////////////


function setRenderChimeState (truefalse) {
  if (truefalse === undefined) {
   // no specific state passed to the function
    return false
  }
  
    try {
      var truefalse = truefalse ? "1" : "0";
      var hasPref = app.preferences.havePref(
        "Misc Section",
        "Play sound when render finishes",
        PREFType.PREF_Type_MACHINE_INDEPENDENT
      );
      if (hasPref) {
        app.preferences.savePrefAsString(
          "Misc Section",
          "Play sound when render finishes",
          truefalse,
          PREFType.PREF_Type_MACHINE_INDEPENDENT
        );
      }
      
    } catch (e) {
      // something went wrong, maybe print or alert the error
      return
     
    };
  };