Beg to differ. When setting up to play backing track small tab with key appears in upper right hand corner tap it and transpose to any key you like. I also use igigbook for scores great in dark spaces no need for music stand light.While there are a myriad of apps for mymiPad i find most of them have major limitations and the iPad bugginess drives me crazy. I type too fast for the keyboard and it keeps putting "m"s in etc etc.
I realB is pretty good but the versioni have doesnt transpose keys. Better to spend your money on Band in a Box if ou have a computer. Imo best practice aid money can buy.