A free app for Android, by NCH Software.
MixPad Multitrack Mixer is a professional recording and mixing studio for Android. It lets you mix your audio and music files, create music tracks, and even record a podcast. You can also mix songs from your own music library and save the results to MP3.
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You can mix as many tracks as you want, each with audio effects you can adjust. You can also add effects such as compression, saturation, or equalization. You can also add a reverb effect to each track. You can even add two different effects to the same song and change the volume of each effect independently.
After recording and mixing, you can save the results to MP3 and several other popular file formats.
