I would like to combine the "Press the button repeatedly" and "Press the button shortly" into one sentence, but the "repeatedly shortly" does not seem correct to me. Even the "shortly" seems not the best word for it. Repeatedly means like clicking through elements of a list, and by shortly I mean don't hold the button down, but release immediately after pressed.
What I would like to express is that someone has to repeatedly press the button to select something from a list of choices, but they should not keep the button continuously pressed for too long.
I also look for the term when someone presses the button and keeps it pressed for a slightly longer time, for some other function to be activated. "Press the button .... "
The action needs not be necessarily very fast. It's similar to clicking through stations on a radio, until we stumble upon something we like. The main emphasys should not be on speed, I wanted to include it only so that the user knows: this is not the same as the "long press" which was explained previously, and had a completely different function.
A very short solution of just 1-2 words would be most appreciated.