That doesn't make much sense. A MIDI controller generates MIDI notes, like when you press a key there is two MIDI notes being sent, one "on" and one "off". When

That doesn't make much sense. A MIDI controller generates MIDI notes, like when you press a key there is two MIDI notes being sent, one "on" and one "off". When you use something like an arpeggiator, the MIDI controller would generate one MIDI note each 1/8 for as long as you hold the key. Or what would be the functional difference between a MIDI generator and controller?