Volume levels varies between stations

[Arielhh]

Why different stations have different volume levels?
Is there something like AGC or AVC that can level the volume of all stations?

[Kaushal-Saraf]

I am just trying to create an internet radio with it, and it works only up to volume 19.
Here is the better code with for internet radio using audio library.
#include <WiFi.h>
#include "Audio.h"

#define I2S_DOUT 25
#define I2S_BCLK 27
#define I2S_LRC 26

Audio audio;

const char* ssid = "";
const char* password = "";

void setup() {
Serial.begin(115200);
WiFi.begin(ssid, password);
while (WiFi.status() != WL_CONNECTED) {
delay(1000);
Serial.println("Connecting to WiFi...");
}
Serial.println("Connected to WiFi");
audio.setPinout(I2S_BCLK, I2S_LRC, I2S_DOUT);
audio.setVolume(19); //[1,19]
while(true){
boolean nc = audio.connecttohost("http://mp3.ffh.de/radioffh/hqlivestream.mp3"); // 128k mp3 // add your favorate station here
if(nc == 0) Serial.println("Not connected! Trying again...");
else{
Serial.println("Enjoy your music.");
break;
}
}
}

void loop() {
audio.loop();
}