shootdaj:
Hi mkl0815, could you tell me what material the orb shell is made out of?
Soory but I cannot tell a lot about the material. It's a simple bulb garden lamp with about 30cm diameter. It's some kind of plastic 2 or 3 mm thick. You can buy them very cheap in a hardware store here in germany.
aarondc:
It's a minor nitpick, but when it comes to UI, even with physical UI such as this, I would always try to keep the UI consistent.
You are right, I'm also not very happy with that. But it will do it's job and at the moment there are no complaints for the inconsistent behavior 
My problem at this point is, that several modes need different inputs. And I have only three knobs planned, what is fairly enough for all modes.
But thank's to all for the kind words about this project. It's almost a recycling project, using a garden lamp, an old plastic pipe, a tabletennis ball and the wooden box is part of the body of an old, broken cuckoo clock. And I thinks for this the result is quite good
Mario.