The virtual keyboard is used to play instruments in amp studio without the need for an external MIDI keyboard. You can use the virtual keyboard to both play and record notes.
Click the virtual keyboard toggle in the controls bar to open or close the keyboard. When you open the virtual keyboard it will assign a portion of your computer keyboard to play an instrument. The keys used for playback are printed on the keys of the virtual keyboard. You can also click on the keys to play them with your mouse. On the left side of the keyboard, you can change the current octave with a minus and plus buttons.
The virtual keyboard can be resized so you can zoom in/out or change the height of the keyboard.