While I have the feeling of the scroll keys more or less under control, I still think this is not an optimal solution and requires too much careful manipulation to be acceptable, certainly in a live situation. After more than a month on the Pico, my earlier suggestion still stands since it would also allow us to use all 18 playing keys.
This is how I would do the scrolling on the Pico:
* Press both octave keys to toggle 'scroll mode' on the strip controller
* Scroll up and down with the strip controller as a sort of 'jog wheel' that advanced or moves the focus, faster or slower
* Press both octave keys to select the item under focus and toggle out of scroll mode
This would also allow much more fine grained control since the movement area is longer.
One thing to note, which might not be obvious to many people, is that scrolling needs to be functional at all times since it operates on the last view that is visible in the browser, even if you switched out of the corresponding mode on the Eigenharp. I really like this approach since it allows you to indicate your focus of interest, go back to the instrument, and continue experimenting in the browser.
Some more observations about this suggestion:
* Currently only one pane of the browser is used, so we really only use one scroll key. When both panes might become active in the future, the pane selection can be done by pressing the corresponding octave key to switch the scroll focus once the scroll mode is active.
* The scroll mode should be clearly visible by changing both colors on the octave keys (for example turn them green)
* If I understood correctly, EigenD and the underlying engine isn't capable of this yet since actions can't be tied to key combinations. However, John hinted that they're working on adding gesture support, which would open up a whole other realm up possibilities.