This application adjusts the audio volume by the automatic operation according to the speed.
There are various usages in this application.
one example, 
It is useful for listening to music when connecting your terminal with car audio.
 Application turns the volume down when you are waiting for traffic lights, or running slowly inside the residential area. 
Afterwards, when the speed is increased, it turns the volume up. 
you don't trouble others even if you listen to music when the window is open.
other examples, 
Please use this application when you listen to music while you are jogging or you are riding a bicycle or a train.
 This application turns up the volume when the noise of the wind and other noises grow because the speed increases.

This app does not have the ability to play music.
However, this can be operated in background. Please use this in conjunction with the music app.
(Except for the terminal that does not support background processing, such as iPhone 3G. In addition, Continued use of GPS running in the background can dramatically decrease battery life.)

Audio output using the Dock connector is not supported.
Using the Bluetooth audio output is supported as long as more than iOS4.