A communications system comprises a physical layer device including a PLD send interface which, in turn, includes PLD parallel information outputs and at least one PLD control output. The system can include a scalping shaker which can receive a slurry and separate a particulate from the slurry, forming an effluent. The EGR system includes an EGR injector, the EGR injector includes an EGR injector valve, an intermediate portion of intake air conduit, a throat portion positioned coaxially with the intermediate portion of intake air conduit. The digitally sampled sound files stored in the computer hard drive are obtained by accessing a web site through the Internet or capturing sound through an audio computer connection to a microphone, CD player, radio broadcast or mass music storage device using software resident in the computer. The device can be mounted to a platform, for example, a camera tripod.