66-channel 192 kHz USB audio interface. 66 channels: 32 in / 34 out. 4 x ADAT/SPDIF input. 4 x ADAT/SPDIF output. 1 x headphone TRS stereo output. TotalMix. USB 2.0, bus-powered. Like all current RME interfaces, the Digiface USB features the powerful digital real-time mixer TotalMix FX. It can perform any mixing and routing operations with all inputs and playback tracks on any hardware outputs. However, the Digiface USB does not have a DSP, so no effects are included. Nevertheless, the mixer includes a Control Room section with talkback, main/phones, fader groups, mute groups, complete remote control via Mackie and OSC protocols, and much more.