RME HDSPe AoX-D - 512-Channel PCI Express Card with Dante and Optional MADIThe HDSPe AoX PCIe x4 audio interface cards combine dual network ports with headphone output, AES3, MIDI, and internal expansion headers for up to four MADI ports. Whether used in a Thunderbolt expansion chassis or built into DAWs or audio processors, these cards send and receive up to 512 channels of audio and provide numerous mixing and routing capabilities. Occupying only a single slot, the PCIe x4 interface transmits and receives up to 512