How to add sound alert to Thinkor Swim Parabolic SAR ?

Hello!

There is a code for parabolic SAR

input accelerationFactor = 0.02;
input accelerationLimit = 0.2;
rec state = {default init, long, short};
rec extreme;
rec SAR;
rec acc;

switch (state[1]) {
case init:
state = state.long;
acc = accelerationFactor;
extreme = high;
SAR = low;
case short:
if (SAR[1] < high)
then {
state = state.long;
acc = accelerationFactor;
extreme = high;
SAR = extreme[1];
} else {
state = state.short;
if (low < extreme[1])
then {
acc = min(acc[1] + accelerationFactor, accelerationLimit);
extreme = low;
} else {
acc = acc[1];
extreme = extreme[1];
}
SAR = max(max(high, high[1]), SAR[1] + acc * (extreme - SAR[1]));
}
case long:
if (SAR[1] > low)
then {
state = state.short;
acc = accelerationFactor;
extreme = low;
SAR = extreme[1];
} else {
state = state.long;
if (high > extreme[1])
then {
acc = min(acc[1] + accelerationFactor, accelerationLimit);
extreme = high;
} else {
acc = acc[1];
extreme = extreme[1];
}
SAR = min(min(low, low[1]), SAR[1] + acc * (extreme - SAR[1]));
}
}

plot parSAR = SAR;
parSAR.SetPaintingStrategy(PaintingStrategy.POINTS);
parSAR.SetDefaultColor(GetColor(5));



I'd like to have a sound alert the moment it Parabolic starts to plot on the opposite side of the chart (trend change)

the sound alert script is here:

http://tda.thinkorswim.com/thinkscript/dark/reference/Functions/Others/alert.html

Where in the code should I insert the alert function?

Thanks!