I'm working on a project that requires recording audio from an FM broadcast. I'm not using the station's stream because the quality is too low (64bit). I'm guessing the best way to record to my mac is to go into a sound card usb device, but am unsure if the portable sound card machines currently avail. now (ie. MOTU Microbook II, Focusrite Scarlett 2i2 etc) will accommodate rca inputs. It seems they will only take XLR. Can I go from XLR to RCA? Or would it be better to make the leap to the Sound Devices USB Pre2 which has on board rca 'in's (as well as a bunch of other goodies.). Any thoughts or ideas appreciated.