Thank you for your answer . Still i got a few doubts .

Can i set the EXACT number of repeats and is the limit of repeats  limited to 10 ?

Can i send with one tap a program change to numerous midi devices (and if  yes how many ) ? Is it the same with control change messages ?

Must the time factor be in a specific mode to send midi control  and so must my signal be affected when i want to change a program of another midi device ? Is it practical in live situations ?