=====Energy curvature=====
In order to adjust how the energies of a single instrument is spread out over the energy curve, it should be possible to apply a factor to "skew" them towards the top or bottom. Effectively applying a curvature to an otherwise linear default. Initially we will implement this on an instrument basis in the CLI (read below). UI implementation comes later.

====CLI implementation====
  drumgizmo --energy-curvature=snare:0.8,tom1:1.7,....
  If you leave one out, it defaults to 1
  If an instrument contains spaces(please don't): drumgizmo --energy-curvature="Fat Snare":4.3
  Or perhaps: --energy-curvature=Fat\ Snare:4.3