This module is bought as my second sequencer in my complete Behringer System55 or Behringer System 55, the very reasonable priced Moog clone (of which the original was used by Keith Emerson). It is much more inuitive than the system 55 as a whole, but than again, a Behringer System 55 is an affordable must, if you want to understand sound synthesis from the elementary principles, control voltages and voltge control. Great module as well to be combined in any eurorack setup, to at least have some sort of historic component in your setup.