Here’s an example how this could be useful: I have set a message on my Expression’s Heel Down to engage a Wah (which works as a LPF) block on the HX Stomp, and disengage on Toe Down position. The problem is that I don’t have a visual representation of the toggle state like with Stomp’s main 3 footswitches that are either dim or lit, so I came up with an idea to change the background of the bank on the MC6 Pro to aqua blue when the HX Stomp is in ‘LPF’ state, and go back to black when the wah is disengaged. It works well and is very helpful, but the way I had to achieve this was send a CC to the HX Stomp’s Expression and then send another CC back from the Stomp to the MC6 Pro’s random preset. It would be much easier if an Expression action could trigger a bank background color change depending on what you are currently controlling (could be volume, mix, envelope filter etc.).
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A Trello card has been created for this request: Feature Request: Set bank background color on expression message