DopplerPlayer has the following features: 1. Support. Mp3, wav, ogg file. 2. Built-in 3D audio effects, including: dance, rotate, swing and updown; Plus it also has some other audio effect: flanger, tremolo, ringing, chorus, echo. All these effects are adjustable. 3. Built-in regular 3-band, 5-band, and 10-band EQ effects, such as: full bass, rock, vocal, jazz, full treble.