Place scratch track where the vocal track sits
Depending on the type of scratch, I would normally not pan your scratches. What I do is place the mono scratch track(s) where the mono vocal track(s) normally sit. I treat scratch elements just like vocal elements in the mix, but I never have a scratch and vocal element playing at the same time. Why?
Well, as a rule of thumb when scratching, you should refrain from scratching over vocals. I hope this is still the norm, because nothing is more annoying than listening to a DJ tearing it up during a verse and drawing your attention away from the all important vocal track(s.) Scratches, like vocals, are normally mono in nature, not stereo. Therefore, I normally place scratches centered in the mix where the vocals sit for simplicity, convenience, and just because it sounds better.
Your thoughts?