Mp3Mixer is a free multimedia app for Android developed by NewJourney. The app allows you to cut, join, and merge MP3/audio files and export them to various music formats. Additionally, you can even mix photos and text and export them to video files.

The app supports most popular music/sound file formats including MP3/M4A/WAV/WMA/OGG/AMR/AWB/OPUS/AAC/FLAC/MKA. You can easily select any portion of the music file by a simple tap and drag. The app also lets you add simple effects and transitions to your audio files. You can export MP3 with different qualities and share them with other apps on your phone.

Moreover, you can merge multiple MP3/audio files into a single file with effects. The app also allows you to load/save music projects you are working on to get your job done easily. You can export various music formats including MP3/M4A/WAV/WMA/OGG/AMR/AWB/OPUS/AAC/FLAC/MKA.

The app is still in development, and any suggestions are welcome.