Bit of a newbie. Macbook Pro, Focusrite saffire pro 40, RODE NTK Condenser Mic. I've recorded some live guitar, superior drummer & midi keyboard parts. I've come to do the live vocals: set the audio pref buffer to 128 or 64, gone into low latency mode; I sing a take, monitoring via headphones into the saffire. Its out of sync/time with the rest of the track! Not behind, but in front. Try singing a simple 1, 2, 3, 4 on the beat to make sure - same thing, they come in noticeably earlier than the start of the bar...PLEASE HELP!