No, it's up to you. In Warzone you can use either 1 or up to 4 beats in total. Let's say you have beats A, B, C and D. If you want to use all of them you have to specify which beat you want to use in particular round. For example Beat A- round 1, Beat B- round 2 etc.
However, you can use two beats or three beats if you want. It's specified when you upload beats. It says something like "if you don't upload any other beat then your beat from the previous round will be used". So if you uploaded beat A for round 1 and beat B for round 2 and you didn't upload any other beat then beat B is going to be used in round 3 and 4 if you advance of course.
NO CAP.
