Returns non-zero if it makes sense to apply a volume 'fade' * (i.e.\ 'balance' between front and rear) with this mapping, i.e.\ if * there are front/rear channels available. \since 0.9.15
See Implementation
Returns non-zero if it makes sense to apply a volume 'fade' * (i.e.\ 'balance' between front and rear) with this mapping, i.e.\ if * there are front/rear channels available. \since 0.9.15