Transferred audio has a click

hi
everytime when i transfer audio files from my macbook to my mpc through usb, my audiofiles have a nasty click at the beginning of the file when i listen to it on the mpc.

Anyone ever had the same problem and know how to solve it?

Thanks

Zero crossing?

Thank you. Didnt came up with that myself. I think i just need to change a setting in Logic that cuts the zero point.

I must add that when playing the audio files on my macbook, no click is audible

Look at the wave form. THen you can see if it is there or not. If it is a loop more than likely, a hit might just be cut so that it is amplitude goes from zero to any dB instantly, which speakers of course can not do. I effect square wave, gives clip.
Or maybe your sample is distorted from the other type of clipping, which is that the sample transients are chopped of, that gives distortion.
So look at the wave form in the mpc of the one that is clipping and see.

I have this problem when i sampled a loop. (drums)
After I sampled the loop I chopped it up in the MP. In playback there is no click. But, when I save the loose hits to an SD card and play the same exact samples back from there, the click appears..