     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()

    $scope.seq.ticks = -1
    $scope.seq.beat = -1
    $scope.seq.semi = -1
  Keyboard.register(83, $scope.reset)

  $scope.toggle = -> if $scope.heartbeat then $scope.off() else $scope.on()
  Keyboard.register(32, $scope.toggle)

  $scope.on = ->
    return if $scope.heartbeat
