const int ledPin = LED_BUILTIN;
int ledState = LOW;

unsigned long previousMillis1 = 0;
unsigned long previousMillis2 = 0;

const long interval1 = 100;
const long interval2 = 700;

const int buzz = 9;

#include <pitches.h>

void setup() {
  // put your setup code here, to run once:
  pinMode(ledPin, OUTPUT);
}

void loop() {
  // put your main code here, to run repeatedly:
  unsigned long currentMillis1 = millis();
  if (currentMillis1 - previousMillis1 >= interval1) {
    previousMillis1 = currentMillis1;
    if (ledState == LOW) {
      ledState = HIGH;
    } else {
      ledState = LOW;
    }
  }
  digitalWrite(LED_BUILTIN, ledState);

  unsigned long currentMillis2 = millis();
  if (currentMillis2 - previousMillis2 >= interval2) {
    previousMillis2 = currentMillis2;
    tone(buzz, 300, 345);
  }
}