Digital Speech Standard (DSS) is a proprietary compressed digital audio file format defined by the International Voice Association, a co-operative venture by Olympus, Philips and Grundig. DSS was originally developed in 1994 by Grundig with the University of Nuremberg. In 1997, the digital speech standard was released, which was based on the previous codec. It is commonly used on digital dictation recorders. Modern phycoacoustical codecs that perform nearly as well at only slightly higher bitrates have led to this speech coding standard being less used in modern voice recording equipment.

MP2 is a lossy audio compression format developed by MPEG (Moving Picture Experts Group). It is widely used for audio broadcasting, while MP3 is more common for desktop and online programs. The format is supported only by some audio players, so you may need to convert it to a more popular one like MP3.