I distinctly remember reading after the link where you were asking for contributions. As I said that is against the rules of the forum which I am pointing out as an admin. And after reading you saying 'feel free to contribute' (which is asking for crowdfunding along with your link) and now reacting how you have to my response makes me think this isn't that legit either.
As for the original question assuming you are genuine, I think you're mixing up a few things. You don't want to use silent/ultrasonic with headphones and you said headphones aren't an option so that is fine in this case.
And it's not a volume level, it's more a frequency that it's not perceived by the conscious mind.
I'm not sure there's something that applies in this case, since you want laughter or music. There is some free programs such as Absolute Self Confidence or Stress Relief though.
As for the original question assuming you are genuine, I think you're mixing up a few things. You don't want to use silent/ultrasonic with headphones and you said headphones aren't an option so that is fine in this case.
And it's not a volume level, it's more a frequency that it's not perceived by the conscious mind.
I'm not sure there's something that applies in this case, since you want laughter or music. There is some free programs such as Absolute Self Confidence or Stress Relief though.