     angular.forEach($scope.t.channels, (notes, inst) ->
       Sound.play(inst) if notes[$scope.seq.semi]
     )
-  Keyboard.register(83, strike)
+  Keyboard.register(80, strike)
   $scope.seq =
     ticks: -1
     beat: -1

    recalculate()
    strike()
  retreat = ->
    return if $scope.seq.ticks <= 0
    $scope.seq.ticks -= 1
    recalculate()
    strike()

  Keyboard.register(76, $scope.advance) # l
  Keyboard.register(37, retreat) # left arrow
  Keyboard.register(72, retreat) # h
  recalculate = ->
    $scope.seq.semi = $scope.seq.ticks % ($scope.t.beatCount * 4)
    $scope.seq.beat = Math.floor($scope.seq.semi / 4)
