Coming back to sliders again as I start to finalise my instrument. Disabling the show text option still leaves the border around the slider.
So I used the method where a hidden slider is placed over a panel, however It still provides the ability for the user to enter values via shift+click (even with show text disabled) which I would like to disable on my vertical sliders.
There still doesn't seem to be a way to restore the basic slider control to its default value when the show text option is enabled.
I could just use a custom slider/panel but then I lose the nice value popup feature. Another option I'm going to try is putting a custom panel over a slider control which I think will allow me to do what I want and still have the value popup the downside to this is I have 8 sliders I want to setup in this way which means 16 controls and some extra code and the whole thing feels untidy.
Update: I managed to get the slider controlling the knob but unfortunately it loses the value popup (I assume this muse be part of the mouse callback of the knob itself).