Change left/right balance on playing audio

[akdasa]

Problem Statement:

Many audio recordings, especially those involving translations or dual-language tracks, are often imbalanced, with one channel (left) dedicated to the translation and the other channel (right) to the original sound. This setup can be uncomfortable and inconvenient for users who wish to listen to both channels equally or prefer one channel over the other.

Proposed Solution:

Introduce an adjustable left/right audio balance slider to the audio playback settings. This feature will allow users to control the audio balance between the left and right channels seamlessly.

User Interface:

1. Add a slider to the audio playback settings interface.
2. The slider should be continuously adjustable, allowing any position between the leftmost and rightmost points, rather than being limited to discrete steps.

Functionality:

1. When the user slides the balance control to the left, audio from the left channel will dominate and be heard in both ears, while audio from the right channel will be minimized.
2. When the user slides the balance control to the right, audio from the right channel will dominate and be heard in both ears, while audio from the left channel will be minimized.
3. The volume of the audio remains constant regardless of the balance adjustment.
4. The central position of the slider means the audio is balanced, with the original sound from both channels being heard as intended.
5. The slider should provide real-time feedback, adjusting the audio balance instantly as the user moves the slider.

Implementation Plan

• Stereo balance controller component lectorium-mobile#2