thanks @mitu , very much appreciate the reply. On HyperSpin, there are a few third party plug-ins (LEDBlinky and EDS) which have access to wheel scrolling events that I'm able to integrate with. EDS uses Windows Named Pipes for example to capture and trigger the events. I have a listener that receives those events via REST URL API calls http://ledpixelart.com/pixelcade-api/ and then update the LED marquee accordingly. Would be awesome to find a way to do this with RetroPie.