Reply to headphones volume control over decks c and d (TP2)

Just for your info, I'm using an S2 and macbook pro.

I have decks C and D set up as track decks which I use for samples. The thing is, deck C plays through the headphones no matter what, and deck D won't, so I have no idea if the sample is in time etc, unless I throw it out live and hope for the best.

Any ideas, I kno that the sample decks have a mute function... but what about decks C and D. I mean sometimes, I'd like to mute the sample in deck C while I'm mixing, but I can't, I can only turn it off or on.

Any ideas...?