Thanks John and Stuart...
Yes, I think this is an annoying thing, and I've send a mail to them telling about this issue... This is certainly solvable by making controls/objects selectable before changing value happens and definitely a touch release before modifying value, with control / object selected...
Yes, indeed, the details screen get rid of this inconvenient thing, but in this case I don't see the point to "graphical interface" (red, green, etc boards with knobs).
In my opinion, I think the value should be modified after a drag operation on screen, not only a touch point on screen.
If the control will work as I tell now, it will be unbeatable:
* object = knob, slider
(I wrote this schema in my computer, the forum does not allow me to enter code in the posting area

)

Regards,
Vali