Reply to Serato itch and V7

Hello all my name is Eddie, I am new to the community s here but they look like a good spot to gather good information. I have a question. I recently started working with serato itch and V7's and a macbook pro. I went thriugh the whole set up guide and made sure my settings on my computer were tuned properly to work with serato. I also went through the set up guide on the v7's to make sure the 2 were linked properly and work properly. For the most part i have to say the software and hard ware work perfect. The only thing that is aggrivating to me is that there is a nob on the V7 where you are able to control effects through serato. one of the V7's the one that is not directly plugged into the computer Via USB works perfectly. The one that is connected to the computer Via usb has drop outs only when i turn the effects on. so it sounds like the music is breaking. does any one know of any way to over come this? any ideas will greatly be appreciated.