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Assuming I only want one channel in the output file, is

sox in.wav out.wav -c 1

equivalent to

sox in.wav out.wav remix 1-n, n being the number of input channels

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The sox manpage says:

channels CHANNELS

Invoke a simple algorithm to change the number of channels in the audio signal to the given number CHANNELS: mixing if decreasing the number of channels or duplicating if increasing the number of channels.

The channels effect is invoked automatically if SoX's -c option specifies a number of channels that is different to that of the input file(s).

So it's not equivalent (channels instead of remix), but the result is the same.

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