> Thanks, this reference helped to understand that
> emacspeak-m-player-bind-accelerator binds only global keys,
> not keys in the repeat map.  Here is a short test case
> that confirms this:
>
>   (repeat-mode 1)
>   (keymap-set global-map "C-; 1" (defun test-repeat-next-line () (interactive) (next-line)))
>   (defvar-keymap test-repeat-map)
>   (put 'test-repeat-next-line 'repeat-map 'test-repeat-map)
>
> And indeed 'describe-repeat-maps' outputs empty "(bound to )".
> This is because the keys in the global map used to enter the
> repeatable sequence currently are not handled by 'describe-repeat-maps'.
> This should be fixed before the next release.

Here is a patch that uses outlines, and outputs the commands
that enter and exit the repeat-map.  For example,

  * ‘buffer-navigation-repeat-map’

  Entered with: ‘test-enter-next-line’
  Exited with: ‘test-exit-next-line’

  Key             Binding
  <left>          previous-buffer
  <right>         next-buffer

These two lines from the patch show the difference between the
commands that enter and exit the repeat-map:

    (setq commands-enter (seq-difference repeat-commands map-commands))
    (setq commands-exit  (seq-difference map-commands repeat-commands))

where 'repeat-commands' are commands with the symbol property 'repeat-map',
and 'map-commands' are commands existing in the map.