Numeric Keypad:

  This  works  exactly  like in QuadraComposer. Sample 1-16 is chosen from
  the  upper  left corner on the numpad to the lower right corner, which is
  the Enter-key. "0" is used to jump forward 16 samples, and "." to go back
  to the previous 16 samples.

  Note that pressing a keypad key, will trigger the sample at the note C-3.
  And that is not changeable yet, sorry!

  Note that if a sample has the volume set to 0, then  it  will  be  played
  with a value of 64.