Hello Lionstracs
Wersi solved the button and slider problem by designing them so that the boards they are attached to output Midi codes, that way the OAS software can easily be programmed to use the buttons and sliders by converting the codes into whatever operation they require, (Other software can also use these codes) also if you have VSTs with learning functions, you can select what part of the VST you wish to control, press the learn key, followed by whatever button or slider you wish to control this function, which then gives you real time control of the VST without the use of the touch screen.
Hope this helps.

Bill