E-MU 0404 PCIe has:
- Two 1/4“ Unbalanced Inputs
- Two 1/4” Unbalanced Outputs
- 24-bit/96kHz S/PDIF In/Out (switchable to AES/EBU)
- MIDI In/Out
As of August 2013 reported as not supporting higher than 48kHz or duplex 24 bit.
Emutrix mixer should support this interface.