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

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"