Well, I figured out what I was doing wrong. Below is the updated sketch, without the long comments, for you to review:
Problem 1 was:
Used the same number for two different things
const int NOT_USED = 8; and int Beam_Sensor = 8; I changed this int Beam_Sensor = 9;
Problem 2 was:
The val was constantly HIGH even though it was supposed to be a digital read each loop.
Beam_Sensor_val = digitalRead(Beam_Sensor);
if (Beam_Sensor_val == HIGH)
So, I added:
delay(500); // a pause to allow the electronics to change state
digitalWrite(ledPin, LOW); // and reset the value to LOW
I've run this a few times and it works great.
Thanks to all for your help and comments! 
//======================================= START __ SETUP ==========================================
// Relay outputs are "active LOW"
const int RELAY_ON = LOW;
const int RELAY_OFF = HIGH;
// Define numbers for the relays
const int AMBIENT_SOUND = 1; // RELAY-1 = Audio 1 = AMBIENT NIGHT SOUNDS = KG-background-02.wav
const int Crypt_Laugh = 2; // RELAY-2 = Audio 2 = Crypt_Laugh.wav
const int ZOMBIE = 3; // RELAY-3 = Air valve 1 for Prop-1 = zombie popper
const int CorpseMoan = 4; // RELAY-4 = Audio 3 = CorpseMoan.wav
const int GATE_SOUND = 5; // RELAY-5 = Audio 4 = GATE OPENING/CLOSING = KG-Gate07.wav
const int GhoSteps = 6; // RELAY-6 = GhoSteps
const int GATE_MOVES = 7; // RELAY-7 = Air valve 2 for Prop-2 = Haunted Gate
const int NOT_USED = 8; // RELAY-8 = NOT USED AS YET
// Define ARDUINO PIN for the trigger input
//const int Beam_Sensor = 8; // Beam Sensor acts like a SPST switch to start the Sequence Of Events
int Beam_Sensor = 9; // choose the input pin (for beam sensor) YOUR INPUT ON PIN 9
int Beam_Sensor_val = 0; // variable for reading the pin status VARIABLE HOLDS DATA
int ledPin = 13; // Turn on the board LED to let me know if the sensor input gets to the Arduino
void setup()
{
pinMode(AMBIENT_SOUND, OUTPUT); // RELAY-1 = Audio 1 AMBIENT NIGHT SOUNDS = KG-background-02.wav
pinMode(Crypt_Laugh, OUTPUT); // RELAY-2 = Audio 2 Crypt_Laugh
pinMode(ZOMBIE, OUTPUT); // RELAY-3 = Zombie Popper Prop
pinMode(CorpseMoan, OUTPUT); // RELAY-4 = Audio 3 moan
pinMode(GATE_SOUND, OUTPUT); // RELAY-5 = Audio 4 gate sounds
pinMode(GhoSteps, OUTPUT); // RELAY-6 = GhoSteps Prop: times; 00-10sec, pause 10-15sec, 15-26sec
pinMode(GATE_MOVES, OUTPUT); // RELAY-7 = Haunted Gate Prop
pinMode(NOT_USED, OUTPUT); // RELAY-8 = NOT USED AS YET
// START UP turn everything off but the background sounds
digitalWrite(AMBIENT_SOUND, RELAY_ON); // RELAY-1 = AMBIENT NIGHT SOUNDS = KG-background-02.wav
digitalWrite(Crypt_Laugh, RELAY_OFF); // RELAY-2 = Audio 2 Crypt_Laugh
digitalWrite(ZOMBIE, RELAY_OFF); // RELAY-3 = Zombie Popper Prop
digitalWrite(CorpseMoan, RELAY_OFF); // RELAY-4 = Audio 3 moan
digitalWrite(GATE_SOUND, RELAY_OFF); // RELAY-5 = Audio 4 gate sounds
digitalWrite(GhoSteps, RELAY_OFF); // RELAY-6 = GhoSteps Prop: times; 00-10sec, pause 10-15sec, 15-26sec
digitalWrite(GATE_MOVES, RELAY_OFF); // RELAY-7 = Haunted Gate Prop
digitalWrite(NOT_USED, RELAY_OFF); // RELAY-8 = NOT USED AS YET
delay(500); // insert pause for sound switch to recognise change of state for Relay-1
digitalWrite(AMBIENT_SOUND, RELAY_OFF); // RELAY-1 = AMBIENT NIGHT SOUNDS = KG-background-02.wav
// pinMode(Beam_Sensor, INPUT); //IR Beam sensor to activate sequence of events
pinMode(Beam_Sensor, INPUT); // declare beam sensor as input
pinMode(ledPin, OUTPUT); // declare LED as output to let me know if the sensor input gets to the Arduino
}
//======================================= START __ SEQUENCE ==========================================
void loop()
{
// is someone setting off the trap?
//if (digitalRead(Beam_Sensor)) // TRIPPED BEAM SENSOR
Beam_Sensor_val = digitalRead(Beam_Sensor); // read input value 5VDC==ON==HIGH OVDC==OFF==LOW
if (Beam_Sensor_val == HIGH) // if the input is HIGH (IR BEAM TRIPPED == 5VDC ON PIN-8)
{
//ACT-1 ZOMBIE ATTACK AND SOUND
// The sensor has been activated.... MOO-HA-HA laughed the evil cow ;)
digitalWrite(ledPin, HIGH); // turn LED on to let me know if the sensor input gets to the Arduino
digitalWrite(Crypt_Laugh, RELAY_ON); // RELAY-2 give loud scream
digitalWrite(ZOMBIE, RELAY_ON); // RELAY-3 popup the zombie
delay(500); // pause for sound switch to recognise change of state for relay 2
digitalWrite(Crypt_Laugh, RELAY_OFF); // turn RELAY-2 off for next go-round
delay(5000); // keep the zombie up for 5 seconds
// by keeping relay on voltage is maintaned to solonoid valve which maintains air to actuator
digitalWrite(ZOMBIE, RELAY_OFF); // turn off air valve to reset zombie for next go-round
// auto air bleed will let zombie slowly drop back down by its own weight
delay(5000); // spacer, pause for 5 seconds allows me to figure out SOE .Sequence Of Events.
//ACT-2 GHOST MOANS, WALKS THROUGH GRAVEYARD AND SOUND OF GATE OPENING
digitalWrite(CorpseMoan, RELAY_ON); // RELAY-4 need loud moan to go with start of GHOST WALKING prop
digitalWrite(GhoSteps, RELAY_ON); // RELAY-6 ....steps 1-8 = ~ 10 seconds....
delay(500); // pause for sound, and ghost steps, switch to recognise change of state for relays
digitalWrite(CorpseMoan, RELAY_OFF); // turn RELAY-4 off for next go-round
digitalWrite(GhoSteps, RELAY_OFF); // turn RELAY-6 off for next go-round
delay(10000); // spacer, pause for 10 seconds, time it takes for first 8 of 16 steps to happen
// Ghost has by now walked to the gate, PROP will pause for 5-6 seconds automatically
digitalWrite(GATE_SOUND, RELAY_ON); // RELAY-4 action=sound of gate opening
// It appears that the ghost is opening gate via sound above
delay(500); // pause for sound card to recognise change of state
digitalWrite(GATE_SOUND, RELAY_OFF); // RELAY-4
//ACT-3 GHOST WALKS THROUGH GATE AND SOUNDS OF GATE CLOSING
digitalWrite(GATE_MOVES, RELAY_ON); // RELAY-7 action=prop gate swings open slowly
delay(6000); // keep prop-2 active for 6 seconds
// spacer, pause for 6 seconds, time it takes for GHOST STEPS PAUSE to complete
digitalWrite(GATE_MOVES, RELAY_OFF); // RELAY-7 action=prop gate swings close slowly
// auto air bleed will let gate slowly close by spring action
// Ghost now automatically takes last steps, 9-16, which is another ~10 seconds
digitalWrite(GATE_SOUND, RELAY_ON); // RELAY-4 action=sound of gate closing as GHOST walks through
delay(500); // pause for sound card to recognise change of state
digitalWrite(GATE_SOUND, RELAY_OFF); // turn RELAY-4 off for next go-round
delay(10000); // spacer, pause for 10 seconds, time it takes for last 8 of 16 steps to happen
// Give ghost time to finish last 8 steps
delay(5000); // spacer, pause for 5 seconds allows me to figure out SOE .Sequence Of Events.
digitalWrite(AMBIENT_SOUND, RELAY_ON); // RELAY-1 = AMBIENT NIGHT SOUNDS = KG-background-02.wav
delay(500); // pause for sound switch to recognise change of state
digitalWrite(AMBIENT_SOUND, RELAY_OFF); // turn RELAY-1 off for next go-round
Beam_Sensor_val = LOW;
}
else
{
// Pause for effect, don't allow system to activate too fast after last run.
delay(500); // spacer, pause for 60000 = 60 seconds when done for real
digitalWrite(ledPin, LOW); // turn LED OFF to let me know if the sensor input gets to the Arduino
}
}
//*********( THE END )***********
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