SoX 14.4.2⚓︎

• Package: master/make/pkgs/sox/
• Homepage: https://sox.sourceforge.net/
• Provides: sox, play, rec — Swiss Army knife of sound processing (play and rec are symlinks to sox)

SoX (Sound eXchange) is a command-line utility for converting, playing, and recording audio files. It supports a wide range of input/output formats and includes various audio effects.

Example of script (named tones.sh) to generate tone sequences, useful to test the audio output at various frequencies (20Hz - 20kHz).

#!/bin/ash

DEVICE="hw:0,0"
#DEVICE="default"
DURATION=3

for FREQ in $(seq 20 10 100) $(seq 200 100 900) $(seq 1000 1000 20000); do
    echo "${FREQ} Hz..."

    sox -q \
        -n \
        -r 48000 \
        -e signed-integer \
        -b 16 \
        -c 2 \
        -t alsa "$DEVICE" \
        synth "$DURATION" sine "$FREQ" 2>/dev/null
done