AudioDroid : Audio Mix Studio is on Google Play!

AudioDroid is a sound & music recorder, editor and mixer for Android phones and tablets. You can edit and mix MP3,  MP4, WAV, AAC, OGG and AMR audio files and create ringtones, alarms, and notifications from them. AudioDroid allows user to add new tracks, mix the tracks and save the mixed audio file in mp4 format. You can record audio with your device microphone and mix the recorded audio file with other audio tracks. AudioDroid allows you to share your recorded or mixed audio files with Whatsapp, ChatOn, Email, Bluetooth, Wifi, Google Drive and Dropbox.