This is similar to a Juno 1 but it has a 5 octave and 61 note keyboard that has velocity and aftertouch and an external memory cartridge slot. Other than that it has the same great sound and features as the Juno 1. Also can take a C-64 memory cartridge for additional patch storage. Sliders and buttons were replaced by membrane buttons and the Alpha Dial which is used to edit and browse through the extensive selection of parameters. Also can do 303 sounds with proper programming.