The PG-Audio devices are 1RU digital audio I/O interface devices for the ProGrid Signal Transport Solution. PG-Audio devices transport analog audio and data signals in a variety of ways that can be customized to fit user needs. The PG16-Audio devices have four different rear types including microphone inputs, Line Level inputs and outputs, and dual microphone preamplifiers. The rears are available in seven different configurations that enable the conversion of signals: 16 inputs, 16 outputs, 8 inputs, 8 outputs and 8 dual microphone inputs with two independent adjustable gains. The PG8-Audio devices have three different rear types that enable the conversion of signals: 8 microphone inputs,8 line inputs or 8 line outputs. Every PG-Audio-FX device can exchange up to 1024 audio channels from the Optocore Fiber Network and 64 audio channels from the SANE network. A single PG-Audio-TP device can exchange up to 64 audio channels for the SANE Network and two AES/EBU ports, each capable of 16 channels. Devices include dual power supplies with automatic switchover.