For the most part, you simply blow with the truetalker. However, you can vary the pitch of the call. Towards the top of the call (where the rubberbands are), you can push down on the reed. Depending on where you push down, the call will come out as a different pitch (bleats to young buck grunts to mature buck grunts) However, if you don't have a lot of mature bucks around your area, I wouldn't use the mature grunt often.