I searched the Audacity Site for that, but could not find that topic. Someone wrote that Audacity can do that. If so - how?
Thanks for your hints!
Top menu bar > Generate. You can make tones, drums, metronomes, etc.
Is that what you mean?
If the basic native tone generators are not doing it for you, there are plugins which generate more complex sounds, see … https://forum.audacityteam.org/t/expression-generator/45227/1
Sorry, my quest lacked precision: I am looking for 20-100 Hz e.g. sinus, rectangular waves, (white) noise, or simply “wall vibrating” noise, probably in a low Hertz range. That file will be saved on a CD and played on a simple CD player.
I tried to delete my newest post, because I overlooked your post, not possible. Probably mentioned tone generator will do the job, thanks!