Very good but it needs one thing, and a couple others

I really like having my old 48 everywhere I go - but its missing one thing.
It desperately NEEDS SOUND. I often think Im hitting a key but actually not, so I often have to redo my calculations. If the app made a "click" for each key stroke it would solve the problem. I think the developer should make available the ability to turn he sound on and off, and even make volume an option. It would be nice to be able to chose the sounds. Maybe even be able to chose different sounds for different keys - numbers, functions, enter,....
Id also like them to make the screen a little bigger, so there are more lines of numbers.
The one other upgrade I would like to see is the ability to change the colors. Maybe even independently so each user can chose the color of the numbers, keys, background, screen and text (independently of the the other colors for each)
Ill say I havent updated to the latest version, Im worried if I do it wont work (as is often the case with many apps).
Make these changes and youll have the perfect calculator.

Me, me, me, me, me about i48