Classic Reverb is a MP3 & Audio software developed by Kjaerhus Audio. After our trial and test, the software is proved to be official, secure and free. Here is the official description for Classic Reverb:

Marydown Editor: Classic Reverb is a nice and Smooth reverb that does a good job on almost any instrument. It can be adjusted to sound like most any Acoustic space, ranging from a small shower to a large concert hall. With the "Hi-Damping" control, it is possible to change the sound from bright and sibilant to a more natural / warmer sound.