It is not so much control as selection.
Like:- Select Waveform (choice of 30 wave names)
or
Select Rompler Patch (choice of 200 patch names)
As far as implementation, you have 'number of clicks', so all you need is to have a 'name each click' option with a list box.
So much of your editor and it's elegance comes from these type of controls so you can imagine a user having the same perspective :)
Anyway. Back to my last example.
This is from my JD990 manual and shows a nice, simple and elegant original LCD menu giving a powerful selection process would potentially lead to a complex setup with Midi Designer (Pro, of course :) ) Remember, this is one of four layers, each having the same options.
http://s1.postimage.org/fxhfdgmhr/example.jpg
- Source 1 and Source 2 each have 6 options (Modulation, Aftertouch, Expression Pedal, Breath Controller, Pitch Bender and Foot Controller)
- The 12 Destinations are shown in the picture
- Each of the four destinations has a Depth value covering 0-50 (easy in MD)
Need this repeated 4 times on one half screen
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Merry Christmas BTW!