It's actually a repetition of repetitions. I've already used abbreviatons for the latter. But now, I dont know what I could use for the "master loop".
I made the first bar and repeated it using, for example, an abbreviation sign in the next bar. Then I write the third measure and repeat it with an abbreviation sign in the fourth measure. So how could I repeat the 4 bars until the end of the song?. By saying "without affecting other voices", I mean that I could use a "repeat sign", however, this sign affects the entire piece.