No way to change keyboard size

So I bought the all sounds pack, and then when I try to play a song, theres no comfortable size on my iPhone 5s. I would have bought more, but since I cant play because the keyboard size or either to big I cant see all the keys or to small I cant play properly, I wont be using this so until there is an option to change the keyboard size. Which should be obvious. Plus theyre to much cutesy there should be a suitable court option as well. Please fix these and I will be a loyal customer, but otherwise this app is useless unless I buy a midi keyboard

Waaahoo!!!! about SampleTank, v2.0.2