Get or set the number of channels of a Sample object or a wav file.
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a Sample object, or a string giving the name of a wav file.
1 for mono, or 2 for stereo.
The replacement form can be used to reset the number of channels of a Sample object (here, filenames are not accepted).
If a mono sample is transformed into a stereo sample, each channel of the stereo sample equals the waveform of the mono sample. If a stereo Sample is transformed to a mono sample,
(left(s)+right(s))/2 is returned.
channels, the number of channels of the sample (1 for mono, 2 for stereo).
setChannels, a Sample object with the new
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