I hooked up my guitar in the the mic port on my Macbook with a mono adapter to ¼ adapter. Than another adapter that was coming out of the headphones to the mixer which the mixer was hooked up to the PA system. The guitar sound effects come out nicely but there is a slight delay when I strum!!! How do you fix this? I wanted to use this for my band but I just couldnt perform with the delay. Ive even tried no-effect and theres still a SLIGHT delay. =( how do you fix this?!?!