I bought the full sized hoochie mamma and it has 3 different settings for variations on the cow call(mew,lost cow, and estrus are the three different sounds the call can make). I have not had a chance to use mine yet however, I hear that they really do bring in the elk!
PS: the baby hoochie should bring in the cows but, like people different elk have different tastes so you might want to invest in the full sized hoochie and keep it on the mew setting if the baby hoochie does not work out for you.