Custom ringtone sounds good on computer, can't be heard on phone I did a ringtone using Audacity and then used this website to convert to mp3. I sent this mp3 file to a friend who said he couldn't hear it well. I have an iPhone so I converted it to m4r. Both the mp3 and m4r files play nicely in my computer. However, when I imported it to my iPhone SE, only certain parts could be heard. Here it is if you want to try it

https://soundcloud.com/jpproducoes/test-ringtone/s-TmLZ7

Open it on your computer, then open the same link on your phone (you can use soundcloud, the result will be the same). On the phone it will sound much more distorted, and some parts won't be audible. I believe this might be due to sampling rate problems, but I am not sure. Any ideas?
Plug your phone into some large speakers.  If you can hear the tone much better, then the problem might be the small size of the speakers on the iPhone, which roll off low frequencies.

To prevent this, make sure any low pitched notes in your ringtone are made with timbres rich in strong higher overtones.

Added: If you create a ringtone from a stereo file, it's probably best if both channels contain exactly the same data.