A free app for Android, by Photo Video Infotech.

This app is a music player with a super cool 3D user interface in a virtual 3D world. The DJ mixer is the most creative music player with a full 3D DJ. It has two turntables, full-fledged 3-band EQ mixer, 3D sound effects, and DJM EQ preset. You can mix any of your favorite songs with the music from the app and set it as a ringtone or notification tone. 

You can also set the sound effects as a ringtone or notification tone. There is a special function given in DJ mixer is that, in text and in recorded sound you can also add effects if you want. You can also adjust the echo voice, pitch, and sound. After mixing your music you can set them as your ringtone and notification tone.