semisolid

Hi, i'm testing the Amplifi TT. Of course it sounds great, BUT I've just realized you can only record processed audio (through usb or mains out), right? Is there anyway I can change or adjust sounds once recorded (like on any plugin)? And...If so, how-where ? Can't find any driver for Mac os x and Logic does not see it. Mac OS X only sees it as a sound card, so can only choose inputs 1 or 2, but both are processed. So here's the MAIN QUESTION: is there any way to record 2 tracks simultaneously from the same single guitar input (1 processed and 1 unprocessed?). thank you for any help!