fix voicefixer node please.

[youforgetsomething]

mode0, 2 got error like this :
only 2D, 3D, 4D, 5D padding with non-constant padding are supported for now.
mode1 with error :
the truth value of an array with more than one element is ambiguous. use a.any() or a.all()

[jeankassio]

fix using node "Convert Audio" and select 1 channel