Orpheus provides eight line input channels and eight line output channels, which can be operated in balanced or unbalanced mode, and each of which can be used with professional ('+4dBu') or consumer ('-10dBV') signal levels. Four of the input channels have selectable microphone preamplifiers, and two of these also have high-impedance, unbalanced instrument input jacks. 24-bit conversion is used throughout, and sample rates up to 192kHz are supported.
Stereo digital I/O is provided in both S/PDIF and optical (TOSLINK) formats. The S/PDIF input can also accept professional AES3 signals, and the S/PDIF output can be switched to AES3 mode if required. The optical connectors can alternatively carry eight channels of ADAT I/O at 44.1k or 48kHz sample rates, or four channels at 88.2kHz or 96kHz.
Orpheus has a dedicated stereo analogue headphone output, with two stereo headphone jacks each with its own level control. MIDI input and output are also provided.
Under Windows, Orpheus can be accessed by any software applications with WDM (Windows) or ASIO capability. Under Apple OS X, Orpheus appears as a Core Audio device. Multiple Orpheus units can be cascaded in both PC and Mac setups by daisy-chaining the FireWire connections.
To deal with low-latency requirements in live sound and over-dubbing, Orpheus has its own fully-featured mixer for each output channel pair (including digital and headphones). When selected, each mixer allows a low-latency mix of any input channels (as well as the output's associated workstation feeds) to be sent to the required outputs.
A front-panel volume control can be assigned to any desired analogue or digital outputs, primarily for use as a stereo or surround monitor level control.