Dual Audio Playback (For example: Layering Ambient Sounds with Music)

[aliciabublitz]

I would love to see a feature that allows users to play two audio sources simultaneously. Specifically, the ability to layer a "primary" background track (like rain, white noise, or nature sounds) underneath a regular music playlist.

A simple toggle or "Layer Audio" button on the Now Playing screen. Users could select an ambient playlist, lock it as the background layer, adjust its individual volume slider, and then browse and play their normal music on top of it.