LED light strip, oscillating adjustable speed and brightness

#include "FastLED.h"

#define NUM_LEDS 60 //The amount of LEDs on your ARGB LED Strip that you wish to use
#define DATA_PIN 7 //The Digital Pin on Arduino that connects to the LED Strip's Data Pin (DIN)

int intensityredPin = A0;
int intensitygreenPin = A1;
int intensitybluePin = A2;
int speedPin = A3;
int speed;
int intensityred;
int intensitygreen;
int intensityblue;

CRGB leds[NUM_LEDS];
//Set an array length the same as the total LEDs on your strip
//so each LED can be addressed separately in setup/loop
//e.g. leds[0] for the first one, leds[1] for the second one and so on


void setup() {
  FastLED.addLeds<WS2812, DATA_PIN>(leds, NUM_LEDS);
  //Initialise the LED strip with the correct strip type (e.g. WS2812 is common),
  //Arduino Digital Pin and no. of LEDs to use

  pinMode(speedPin, INPUT);
  pinMode(intensityredPin, INPUT);
  pinMode(intensitygreenPin, INPUT);
  pinMode(intensitybluePin, INPUT);
  Serial.begin(9600);
}


void loop() {


  green_led();
  revgreen_led();

}

void green_led() {
  for (int i = 0; i < NUM_LEDS; i++) {
    intensityred = map(analogRead(intensityredPin),0,1023,0,255);
    intensitygreen = map(analogRead(intensitygreenPin),0,1023,0,255);
    intensityblue = map(analogRead(intensitybluePin),0,1023,0,255);
    leds[i] = CRGB(intensityred,intensitygreen,intensityblue);
    FastLED.show();
    speed = map(analogRead(speedPin),0,1023,0,255);
    //Serial.println(speed);
    Serial.println(intensityred);
    Serial.println(intensitygreen);
    Serial.println(intensityblue);
    delay(speed);
    FastLED.clear();
  }
}

void revgreen_led() {
  for (int i = NUM_LEDS - 1; i >= 0; i--) {
    intensityred = map(analogRead(intensityredPin),0,1023,0,255);
    intensitygreen = map(analogRead(intensitygreenPin),0,1023,0,255);
    intensityblue = map(analogRead(intensitybluePin),0,1023,0,255);
    leds[i] = CRGB(intensityred,intensitygreen,intensityblue);
    FastLED.show();
    speed = map(analogRead(speedPin),0,1023,0,255);
    //Serial.println(speed);
    Serial.println(intensityred);
    Serial.println(intensitygreen);
    Serial.println(intensityblue);
    delay(speed);
    FastLED.clear();
  }
}