How to merge several audio files using sox

Question

I use this command to merge two audio files into one using sox:

sox end.mp3 -p pad 6 0 | sox - -m start.mp3 output.mp3

I was wondering how

Answer 1

You can do it with one invocation of sox like this:

sox -m in1.mp3 in2.mp3 in3.mp3 out.mp3

If you want to combine this with the pad effect you need to be clearer about what you want.

Answer 2

To combine mix and effects (pad, trim etc) use the following:

sox -m "|sox end.mp3 -p pad 6 0" start.mp3 output.mp3

The general pattern is:

sox -m input1 input2 ... inputN output

where inputX can be either a filename or a pipe in quotes

"|sox end.mp3 -p pad 6"