Input mode: when set to Drumkit the keys on your MIDI keyboard will map to the instruments in your drumkit. If you set it to Instrument the keys of your MIDI keyboard will trigger the instrument that is currently selected. The pitch of the instrument will follow the key you press on your keyboard. This feature is mainly used for non-drum instruments (see Section 4.3 for details). An example: if you use a sample of a piano for one of your instruments, you will be able to 'play' that piano instrument using your keyboard just like you are playing a piano synth.

Preferences: opens the main preferences window (see Preferences for details).