SOX audio tool Quick Reference Guide

generate file

Generate 1 second of white noise.

sox -n output.wav synth 1 noise

Generate a 1-second sine tone.

sox -n output.wav synth 1 sine 440

Generate a 10-second sine sweep.

sox -n output.wav synth 10 sine 0:20000

Exponential sine sweep

sox -n -r 44100 sine-sweep.wav synth 10 sine 5/22050

play

Play synthesized audio.

play -n synth sine 440 trim 0 1 gain -12

play sine verbose 24 bits /=exponential

play -V -n -b 24 -r 48000 synth 10 sine 20/20000

And then ARTA:

Fs (Hz): 192000
FFT: 4096
Wnd: FlatTop
Avg: Peak Hold

modify
Reduce level by 12dB
 sox speech.wav output.wav gain -12

Crop to the first 1 second of the file.
 sox speech.wav output.wav trim 0 1

Reverse the contents.
 sox speech.wav output.wav reverse

Normalise the contents to 0dBFS.
 sox speech.wav output.wav norm

Equaliser (-6dB @ 100Hz, -24dB @ 8000Hz)
 sox speech.wav output.wav bass -6 100 treble -24 8000

Add room modelling reverb.
 sox speech.wav output.wav reverb 50 50 100

Trim digital silence from start and end.
 sox input.wav trimmed/output.wav silence 1 0.1 0 1 0.1 0
-
 sox infile outfile gain -n
normalises to 0dB, and

 sox infile outfile gain -n -3
normalises to -3dB.

effects
chorus effect:
A typical delay is around 40ms to 60ms; the modulation speed is best near 0.25Hz and the modulation depth around 2ms.  For example, a single delay:
 play guitar1.wav chorus 0.7 0.9 55 0.4 0.25 2 -t

Two delays of the original samples:
 play guitar1.wav chorus 0.6 0.9 50 0.4 0.25 2 -t  60 0.32 0.4 1.3 -s

A fuller sounding chorus (with three additional delays):
 play guitar1.wav chorus 0.5 0.9 50 0.4 0.25 2 -t 60 0.32 0.4 2.3 -t 40 0.3 0.3 1.3 -s

compand
The following example might be used to make a piece of music with both quiet and loud passages suitable for listening to in a noisy environment such as a moving vehicle:
 sox asz.wav asz-car.wav compand 0.3,1 6:-70,-60,-20 -5 -90 0.2

The transfer function (`6:-70,...') says that very soft sounds (below -70dB) will remain unchanged.  This will stop the compander from boosting the  volume  on  `silent' passages such as between movements. 

However, sounds in the range -60dB to 0dB (maximum volume) will be boosted so that the 60dB dynamic range of the original music will be compressed 3-to-1 into a 20dB range, which is wide enough to enjoy the music but narrow enough to get around the road noise.  

The `6:' selects 6dB soft-knee  compand-ing.   The  -5  (dB)  output gain is needed to avoid clipping (the number is inexact, and was derived by experimentation).  

The -90 (dB) for the initial volume will work fine for a clip that starts with near silence, and the delay of 0.2 (seconds) has the effect of causing the compander to react  a  bit  more  quickly  to  sudden  volume changes.