I'm trying to edit a podcast, and in order to test whether the file sounded right, I tried listening to it on my phone. This podcast is an .mp3 file that was edited in Audacity, and it contains two audio tracks that I mixed together before I exported the file. When I listen to the .mp3 on my computer, whether it's in Audacity, VLC, or Firefox, both tracks can be heard perfectly fine. And if I listen to it on my phone with earbuds in, it still sounds normal. However, when listening to the file on my phone's onboard speakers, only one of the audio tracks is audible. In other words, when you listen to the exact same file hosted on the exact same website on the exact same phone with a different audio output, it sounds completely different.
I'm about to tear my hair out. I've used the exact same technique before to edit several other podcast episodes, with no problems on any device. The file can be found here, and the first part that becomes different starts about 23 seconds in. If you listen to it on a phone's onboard speakers, there will be a few seconds of silence. If you listen to it on a laptop or on a phone with earbuds, you'll hear an excerpt from "God Rest Ye Merry Gentlemen." I tried this link on two laptops (both running Windows 7) and three iPhones. I also had a friend try it on his Android phone and he ran into the same problem.
Does anyone know how to fix this or how it could even be possible?