Up and down key to increase and decrease values inside input boxes ...

Ideas & suggestions
1

… i think this would be quite useful sometimes. So i just need to press one key, when i want to change the note value from C2 to C#2.

e.g.:

notes:

Up C2 -> C#2
Down C#2 -> C2

decimals:

Up 1.000 -> 2.000
Down 2.000 -> 1.000
Shift+Up 1.000 -> 1.001
Shift+Down 1.000 -> 0.999

integer:

Up 1 -> 2
Down 2 -> 1