I am a live sound engineer, you always need more hands to mix live shows. The Avid Profile and now S6L has a General purpose input and output connection, problem was no one made and buttons or LEDs to get in and out of it, So i made them myself. It was around 2012, the first tour i used them on was Atoms for peace. The colors were due to what i could get from the supplier. They are LED lit with clear covers for labeling and easy to see/read in the dark. These buttons allow you to trigger events on the console, which can be anything you can think of. Mute FX, switch A/B inputs for backup vocal, load snapshots, tap tempo