Ok I'm going to answer you from this last post rather than the PMs, it is very hard to follow what issues you have and haven't fixed when you send me so many messages (I have to sleep and work too). Also there is a capx here to work with so -
First off, you can hide the center symbol a few ways - the simplest is to make it invisible on start of layout. A second way is to have it invisible by default, and whenever you create new instances, set those visible upon creation. A third way would be to not have it exist at all. Technically it isn't necessary, but I thought it was nice to have a point of reference for the other events, as well as a visual representation of the various slider settings. It would be my intention to hide/remove it for a final version anyway.
So I had used event 2 to set every textbox to the slider value every tick to have a realtime representation of the slider values. (I tried the sliderbar "on changed" condition as well, but this only triggers when you let go of the sliderbar, so I decided to go with every tick). This event as it is only works for numbers though. Since you have letters now, you'll need to make an exception for that slider. You can do this by changing the first TextBox only to the correct letter after all the other TextBoxes have been updated.