trying to figure out the best way to make glossary accessible

Hey,

I've got a glossary - originally I started making it accessible with these
rules

The currently selected level is removed from the reading  / navigation
order - so for example if you  have selected C you would hear
glossary letter c selected, if you then decided to navigate through the
list you would hear

glossary letter A, glossary letter B, glossary letter D, glossary E....

however there is a filter on this glossary, which now I'm making
accessible. So if you write in the  starting phrase anti, then of course
only words starting with a will be shown.

so if I write anti and I tab from the filter field I hit the A button, and
then tab again I go into the list of terms starting with anti. This means
that the way for  a keyboard user to be able to click on the letter B they
should go back to the input field and remove the filter text.

The reason I did this was to keep people from having to tab through all the
glossary letters - but perhaps when the filter is done you should be
focused in the beginning of the words matching the filter and not turn off
the reaching of other glossary buttons?

Thanks,
Bryan Rasmussen