Reduce display brightness and volume by quarter notches on Mac

Sometimes you'd be listening to something on your mac with a volume that corresponds to last bar. Then pressing the volume down for one more time would mute it. But one'd wish that there was something else one could have done to bring it to little less than how it was before but not mute it. Here is the solution:

option + shift + brightness buttons
option + shift + volume buttons
Pressing brightness or volume up/down buttons while holding option and shift down would increase/lower the brightness or volume by quarter notches and there by gives you greater control.