The CMP30 is an All-In-One digital audio source device which accommodates three different kinds of audio sources into one single device. It combines a CD-Player, MP3 player and AM/FM RDS tuner into one single rack space 19” housing, offering a flexible, multi-functional and compact solution for many applications where multiple source devices are needed. Some typical application examples can range from simple standard audio systems to the most complex and advanced Multi-Zone audio distribution systems. Besides the necessary control and function buttons, the CMP30's front panel also contains a clear LCD screen displaying the operation mode with the ID3 and RDS information of the currently playing track or radio station. Its CD slot, USB slot and SD/MMC memory card slot make it possible to play regular audio CDs, but also MP3 audio CDs and MP3 files stored on USB memory sticks or SD/MMC memory cards. On the rear side are three audio outputs provided. Two of them are fixed audio outputs with a constant line level output carrying the signal from the CD/MP3 player and the tuner. This way the CD/MP3 player and tuner can operate simultaneously, making the device perfect for Multi-Zone audio distribution systems where multiple audio sources are required. The third audio output is a Variable audio output with volume control. The signal present on this audio output can be selected between CD/MP3 and Tuner. An RS232 control port makes the operation possible from external control devices such as home automation systems.