I was using this to connect my iPhone to other interfaces. BEHRINGER UCA222 U-CONTROL Audio Interface ■ Audio Interface ・Features 2 analog inputs/outputs and a digital S/PDIF optical output. The stereo headphone output with level control allows monitoring of both input and output terminals via a switch. This interface is the complete audio solution, bridging the gap between analog and digital. ※ The U-CONTROL UCA222 and UCA202 U-CONTROL only differ in color. There are no functional differences. ・Simultaneous Input/Output: 2in/2out ・Connection: USB ・Input Terminals: RCA pin x2 ・Output Terminals: RCA pin x2, S/PDIF optical x1, Headphone output stereo mini x1 ・Dimensions: 8.8W x 2.2H x 6D cm ・Weight: 120g ■ Operating Environment Windows ・Processor: Pentium III/Athlon XP 1Ghz or higher ・USB port x1 (USB 1.1 or higher) ・512MB or more RAM ・Supported OS: Windows XP, Windows Vista, and Windows 7 (32, 64bit) Mac ・Processor: G4 1.5GHz or dual-core 1.6GHz or higher ・USB port x1 (USB 1.1 or higher) ・512MB or more RAM ・Supported OS: MAC OS X 10.4 or later Windows drivers and software can be downloaded from the manufacturer's website. CD-ROMs are not included with current models. Because it is dedicated to line input, input sensitivity cannot be set on the unit itself. Recording levels must be set on the software side.