ADC keyboard and fast response to user input, possible?

[Acetronics2]

So what I need.
if user presses key, there should be immediate response, but if he keeps it pressed, variable value should increase slowly, so he won't skip desired value.

Hi,

What's YOUR time lag for " immediate " ...

as always, this is a highly subjective point of view ...

Generally ... " immediate " means ... Interrupt !

Knowing your general way of thinking ... that probably could be much slower than a few microseconds ...

just consider the time spent between your thinking you must strike a key, and the act of striking the key, may be add the time needed to analyze the info that decide you to strike wich key , plus the time to define as a target the right key ... : interesting point of view, no ???

" immediate ", you told ???

Alain