Available since LÖVE 0.9.0  
 This function is not supported in earlier versions. 
Gets the number of channels in the Source. Only 1-channel (mono) Sources can use directional and positional effects.
channels = Source:getChannels( )
None.
number channels
    © 2006–2016 LÖVE Development Team
Licensed under the GNU Free Documentation License, Version 1.3.
    https://love2d.org/wiki/Source:getChannels