Hydrogen GUI update

I'm currently working on some updates for the Hydrogen manual, and i also made some mock-ups of the Hydrogen GUI.  More specifically the pattern editor control buttons (the part just above the pattern editor)
Currently this is a mix of buttons, 'LCD' displays and dropdowns.  This inconsistency has been bugging me for some time now and i decided to have a go at it.
First priority : replace the different elements with simple, intuitive buttons. Simple.

The buttons are all bitmaps so it is quite time consuming to get a good looking 'icon' on them.

Below is a first attempt (top=new, bottom=current) :

It's far from perfect, but it's a start !