Monitoring Help, new to mac Options

[djmb]

alright. so i just got an apple powerbook, i have a mixer connected via line In, and i have speakers connected through headphone jack..

when i play music through the mixer, i use monitoring with garage band (dont know any other program that has it)

but its a little behind, can anyone please tell me what program, or how i can set it so its active monitoring real time? because on PC it was so easy, now on mac i need software to do it, and its not even accurate

please help
i cant make mixes until i fix this

i really need zero delay, it has to be possible.