I just tab to the slider and adjust it with the arrow keys, page up/down, etc. Same goes for many of the controls inside most apps. I don't have enough usable

I just tab to the slider and adjust it with the arrow keys, page up/down, etc. Same goes for many of the controls inside most apps. I don't have enough usable vision to use a mouse even a little bit. Thanks for your answers, I've got some really great responses to this posting so far.