Christian, have you played an Audya yet?
If not, you might want to know that there are a great many dedicated buttons so that you can access commands without going through a lot of menus.
Also you can opt to call up a lot of functions, such as styles, registrations and sounds, by entering numbers, rather than scrolling through menus.
There are some tasks that require going through menus, but as a rule they are not tasks you'd be doing in real time while playing.
Although I am not visually challenged, it appears to me that the Audya would be one of the most user-friendly keyboards for you.
I only hope OS 4.0 will help even more.
Hope this helps,
DonM
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DonM