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I just want to be able to play two songs on top of one another (on any streaming platform) and have them have 2 separate volume sliders...

If that's all you want you can very easily do this with a cheap mixer and two devices capable of streaming.

I just want to do this in-app, on the bus/train/car. I'd even be willing to pay more for the subscription

It would be a good feature. I wonder if you could run two copies of the app on android and split screen them.