If you're feeling discouraged, remember that sonic technology was created to make public spaces inhospitable to young people (by using a frequency that causes discomfort in younger ears) & the kids said 'lol bet' + turned it into a ringtone so they could ID texts while under adult surveillance
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(If you wanna check out the tones + see what you can hear, go onto the Mosquito Ringtones website) http://www.freemosquitoringtones.org/