Drum offers two apps in one, Drum and Piano.
When you first Open Drum You will see a "Equalizer" This display can be chosen to turn "Off" or "On" . Also you will see an indication of how long you have been playing. At the Very top you will see a slider, as you slide left and right the sound of the Drums, Guitars, Etc will be affected.
The Guitar option is an great option in Drum, There are two different guitars, one on the left and another on the right. Both Guitars play different sounds. Play and strum actual chords, As if you were on a real guitar! Play your iPad like a real guitar, Along with Genuine, acoustic guitar sounds.