Reply to Pitch lock for Sample decks on S4?

When I DJ, I use the pitch lock (i.e. pitch stays the same regardless of tempo) for Decks A & B. I've tried, but I can't find a pitch lock for the sample decks C & D. Is there any way to do this? I'm really tired of not being able to use the sample decks for their intended purpose because the pitch of a sample is different than the track currently being played.