In1 RCA S/PDIF.
In2 Toslink optical.
In3 RCA S/PDIF / XLR AES-EBU.
In4 Toslink optical / RCA S/PDIF.
In5 RCA S/PDIF / ATT connector.
In6 USB AUDIO (up to 96 kHz / 24-bit PCM stereo only).
In7 to In10 HDMI.
USB CONTROL, used for configuration.
RS232, external control system.
Any inputs from 1 to 10 can receive stereo audio encoded signal up to 96 kHz/Bit.