basic keys:
CTRL + o: open new url
CTRL + q: quit
CTRL + a: speak line by line automaticly.
ARROW-LEFT: navigate back
ARROW-RIGHT: select, execute an element. similar to ENTER
ARROW-UP: navigate previous element
ARROW-DOWN: navigate next element
ENTER: submit input, follow a link etc.
some advanced keys:
PAGE-UP: navigate previous part
PAGE-DOWN: navigate next part
CTRL + F: find string
SPACE-BAR: stop speech
ALT + m: turn on/off mute mode
ALT + [: set lower base pitch
ALT + ]: set higher base pitch
ALT + -: speak lower
ALT + =: speak louder
ALT + ,: speak slower
ALT + .: speak faster
ALT + l: change current language
ALT + 0 to 9: change voice variant
e: change current page encoding