QMP3Gain is a multiplatform graphical user interface of the popular MP3Gain. The latter analyzes mp3 files to determine how loud they sound to the human ear. It can then adjust the mp3 files so that they all have the same loudness without any quality loss. This way, you don't have to keep reaching for the volume dial on your mp3 player every time it switches to a new song.
QMP3Gain is being developed on Linux (Ubuntu) based on QT5 framework. The application has a convenient Windows installer, so it can also be run easily there. For the time being there is no Mac OS support yet.
If you want to create a bug ticket, you may help a lot the author to analyze the issue attaching the application log in your ticket.
To get the log file you have to configure the application at first. Please follow the next steps inside the application: