device resting in front of him. For Leo, words weren't something he spoke with his voice; they were gems he carefully selected from a digital grid.

"I go to park," the device spoke in its clear, robotic tone. Next came the characters . He tapped "I see Sam," Leo added.

AAC gain, also known as audio gain or loudness gain, refers to the process of adjusting the amplitude of an audio signal to achieve a specific loudness level. In AAC, gain is used to normalize the loudness of an audio signal, ensuring that it meets the required standards for playback on various devices and platforms.

fdkaac --bitrate 256k --scale 3 input.wav

If you have ever downloaded an MP4 file, edited a video for TikTok, or mastered a podcast for Apple Podcasts, you have interacted with AAC (Advanced Audio Coding) files. But what exactly is "gain" in this context? Is it the same as volume? Does changing gain ruin the quality of a high-efficiency codec?