A device for transmitting engine sound into an interior of a motor vehicle includes a sound transmission line having a first end in acoustic communication with an air intake tract and a second end arranged to direct engine sound towards the motor vehicle interior. The present invention has a cost and size advantage compared to traditional pumps and is a very compact and potentially disposable pump device design. Techniques for providing a dynamic recommendation engine and techniques for rating media entities are also included. Other embodiments are also described and claimed. Therefore, it is not necessary to use an existing complex operation method. These compounds are useful in pharmaceutical compositions whose use includes the treatment of obesity.