MPDP is the file extension used by an extensive audio mixing program called MixPad. MPDP files are used to store audio projects made in the program. The MPDP files themselves, however, do not contain the actual audio data, but all information about the structure of the mix. This is data on the number of tracks, audio files used and other information.

MixPad is used to produce recordings that can use multiple sound sources and mix them appropriately.