Apogee Symphony 64, Base Card for direct connection to Rosetta 200/800, (16x AD/DA with X Symphony card) on a Apple MAC, PCI Express Card - 64-channel digital I/O (24-bit/192kHz), 2x 32 channel, PC-32 connectors bi-directional, compatible with all Core Audio applications, includes Apogee Maestro software for control and routing.