$ sox -t ossdsp -w -s -r 44100 -c 2 /dev/dsp recording.wav
Creating sounds with play and saving the sound to file
$ play -n synth 1 sin 234
$ play -n synth 1 sin 234 sin 345
$ sox -n sample.mp3 synth 1 sin 234 sin 345
$ play -n -c1 synth sin %-12 sin %-9 sin %-5 sin %-2 fade h 0.1 1 0.1
Here's a guessing game one liner, asking you to guess the frequency,
courtesy of the Twitter account for
$ f=$(($RANDOM%5900+100));play -qn synth sin $f trim 0 0.75 vol .1;read -p "Hz(100-6000)? " g;printf "Hz=$f; Off by %d\n" $((f-g))
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source software including Rattle and wajig.
Also the author of Data Mining with Rattle and Essentials
of Data Science.