Available since LÖVE 0.9.2  
 This function is not supported in earlier versions. 
Gets the current global scale factor for velocity-based doppler effects.
scale = love.audio.getDopplerScale( )
None.
number scale
    © 2006–2016 LÖVE Development Team
Licensed under the GNU Free Documentation License, Version 1.3.
    https://love2d.org/wiki/love.audio.getDopplerScale