Usually I use them like I mentioned, placing my thumb on the phone’s speakers and playing the sound, you can get a better effect by shaking a water bottle vigorously for 10 seconds and sticking the speaker to the bottle, then playing and drinking the water

I’ve opened up another post, Medical Grade Carbon Dioxide. Try the water method and see if that has an effect

https://www.patreon.com/chickfiles/posts/161848133?utm_campaign=postshare_creator