Background music played through surround sound speakers
WA doesn't support surround sound being a 2D game, but why not make use of any unused speakers by having them play the background music?
Most of these music tracks actually have ambient sound effects within them (like rain) which would sound great in surround sound.

Um, I’m not really sure what exactly do you mean… are you talking about playing the audio track through a different set of speakers than the game?
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Cammy commented
Do your speakers not have a "Matrix" mode?
There's a button on my speaker's controller that makes the rear speakers duplicate the front ones (The rear left will duplicate the front left, and the rear right will duplicate the front right when activated) -
explorer09 commented
I think this could be done by making a Wormkit module, or improving the old one such as wkSoundCardSelect .
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Chip commented
Currently when I play WA, my 2 rear speakers are unused, they play no sound. (I have 5.1 surround sound setup).
I think it would be great if the game could use those 2 speakers and have them play the ingame background music - the front speakers could still play the music too. So all speakers end up playing the music but only the front ones should play the sound effects.