How do I reverse my sound volume math for my volume slider?

I'm building a video player and am kinda stuck at the volume slider part. It's a YouTube style vertical slider, meaning if the slider is in the top position volume should be 100% and if the slider is dragged to the bottom position sound should be 0. Currently it's doing the opposite of what I want :( Dragging the slider down will make the sound louder, while dragging up lowers it. Here is my code below dealing with the volume slider. ``` // Sound Controller Settings ······························ soundController = new SoundController(); soundContrColor = soundController.colorChip; soundContrGray = soundController.grayCover; soundContrGray.visible = false; soundController.visible = true; soundController.buttonMode = true; soundController.soundSlider.addEventListener(MouseEvent.MOUSE_DOWN, sliderDown); // SoundController Button Mouse Events ························ public function sliderDown(event:MouseEvent):void { soundController.soundSlider.startDrag(false, dragBounds); soundController.soundSlider.addEventListener(MouseEvent.MOUSE_MOVE, sliderMove); soundController.soundSlider.addEventListener(MouseEvent.MOUSE_UP, sliderUp); soundContrGray.visible = true; } public function sliderMove(event:MouseEvent):void { soundContrGray.height = soundController.soundSlider.y; userVolume = Math.round(((soundContrGray.y * soundContrGray.height) / 10) - 4); //userVolume = soundContrGray.height; setVolume(userVolume); trace("soundController.mouseY = "+soundController.soundSlider.y); trace("soundContrColor.height = "+Math.round(soundContrGray.height)); trace("userVolume = "+userVolume+"\r"); event.updateAfterEvent(); } public function sliderUp(event:MouseEvent):void { lastVolPoint = soundContrGray.height; setVolume(userVolume); event.updateAfterEvent(); soundController.soundSlider.stopDrag(); soundController.soundSlider.removeEventListener(MouseEvent.MOUSE_MOVE, sliderMove); soundController.soundSlider.removeEventListener(MouseEvent.MOUSE_UP, sliderUp); } ``` [TRACES] when I drag all the way to the top: ``` soundController.mouseY = 6 soundContrGray.height = 6 userVolume = 0 ``` [TRACES] when I drag all the way down: ``` soundController.mouseY = 56 soundContrGray.height = 56 userVolume = 30 ``` I believe this is where the problem lies: ``` userVolume = Math.round(((soundContrGray.y * soundContrGray.height) / 10) - 4); ``` The (-4) is an offset value so when you drag it all the way to turn it off, it's 0 and not 4. I need to reverse this somehow, so the traces above will swap... going down will make userVolume = 4 and going up will make it 30. Thanks in advance for anyone that takes a look at this one! :)