This program works invisibly. Loudness decreases with the adjusted period of time to the adjusted minimum. If your friend prefers the biggest level of loudness, you can use this latent program. The program changes only loudness wav, aac, vqf, avi, wmv, wma, mp3, ogg..., but not MIDI. The program is started after pressing button OK and becomes invisible.It can be stopped in Task Manager (Ctrl+Alt+Del).