Hi all - I am looking into a Focusrite interface and had a couple of simple questions. I like the 2i2, and the USB power, (and have tried a friend of mines and it is dead quiet) but would like a couple more inputs. Are the units with the standard wall adapter just as quiet, any issues, etc?. I apologize for a simplistic question, but I am changing my setup from the Tascam US1800 which will not work with my Mac I have now. (and didnt use all the channels in the 1800 either). Thanks!