Make GlobalVolume change running audio #18952
Description
What problem does this solve or what need does it fill?
In a settings menu, users want to change the volume of music that is currently playing.
What solution would you like?
GlobalVolume already exists, let's make also affect currently playing volume :)
What alternative(s) have you considered?
Make the user write this boilerplate or move it into a third party plugin.
Note to any interested readers: this link shows you an example of how to implement this feature :)
Additional context
This issue came up while implementing a settings menu for bevy_new_2d