Universal Audio Apollo Twin USB High-Resolution USB Interface with Realtime UAD DUO Processing Desktop 2x6 Super Speed USB 3.0 audio interface for Windows 7/8 with world class 24 bit/192 kHz audio conversion Real-time UAD Processing for tracking through vintage compressors, EQ's, tape machines, mic preamps, and guitar amp plug-ins with near zero latency. Unison technology gives you the tone of the world's most sought-after mic preamps - including their impedance, gain stage "sweet spots", and component-level behaviors. Compatible VST, RTAS, or AAX 64 plug-in host DAW software Runs UAD Powered Plug-Ins via VST, RTAS, and AAX 64 i8n all major DAWS. Includes the "Real-time Analog Classics" UAD plug-in bundle. All other plug-ins are sold separately via the UA Online Store. All trademarks are property of their respective owners. 2 premium mic/line preamps, 2 line outs, front panel Hi-Z instrument input and headphone out, 2 digitally controlled analog monitor outs for full resolution at all listening levels, up to 8 channels of additional digital input via Optical connection