App for remapping HW buttons?

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Been searching a little, but couldn't really find what I was looking for.

I'm looking for an app that would let me rebind the hardware buttons on my x8. A bit more specifically, something that would only remap buttons while screen is off, so I don't lose any functionality while screen is on.

The purpose of this would be to allow me to use hardware buttons to control music. Thinking menu/back keys for skipping tracks and camera key for pause. Not like the menu/back buttons do anything when screen is off anyways.

Optionally, long-press of volume keys for skipping tracks if menu/back is a no-go.

Not asking for anyone to write this app, just wondering if anyones been down the same street and found something usable

Other than creating your own app/hack, 'Tasker' may be able to help you out. I'm not sure if want you want to do is achievable with 'Tasker', but it's worth a shot.