The Grasshopper is a MIDI sequencing application. MIDI is a complex andold technology. Understanding MIDI is key to using the Grasshopper. Auser must understand MIDI sequence, track and channel paradigm to usethe Grasshopper effectively. However, the Grasshopper is a simpleapplication and may present possibilities of learning to users who arenew to MIDI. The Grasshopper is best used with a MIDI Keyboard controller (USB) withno tone generator. The Grasshopper maps MIDI events to the AppleInternal Synthesizer from a (USB) MIDI Keyboard controller. You may usethe Grasshopper's Virtual MIDI Keyboard to create MIDI events if you donot own a MIDI keyboard controller.