The controller is a 8x8 grid, with a row of buttons on the top, and a column of buttons on the side. The grid itself represents step 1 - 64. It uses the following global layout:

[  up  ] [ down ] [ left ] [ rght ] [ sseq ] [ mtrx ] [ song ] [ scen ] ( bpm  ) 
[      ] [      ] [      ] [      ] [      ] [      ] [      ] [      ] [ shft ] 
[      ] [      ] [      ] [      ] [      ] [      ] [      ] [      ] [ copy ] 
[      ] [      ] [      ] [      ] [      ] [      ] [      ] [      ] [ pste ] 
[      ] [      ] [      ] [      ] [      ] [      ] [      ] [      ] [ undo ] 
[      ] [      ] [      ] [      ] [      ] [      ] [      ] [      ] [      ] 
[      ] [      ] [      ] [      ] [      ] [      ] [      ] [      ] [ keyb ] 
[      ] [      ] [      ] [      ] [      ] [      ] [      ] [      ] [ fill ] 
[      ] [      ] [      ] [      ] [      ] [      ] [      ] [      ] [ trns ] 

• The top buttons determine which mode is currently selected.
  • The arrow buttons depend on which mode currently is active
• The (bpm) is not a button but a blinking LED which blinks on every beat.
• The [shft]-button allows for functionality depending on in which screen you are.