When people in the comments don't understand what a sound check is. They're not trying to sound album ready. It's to check levels and fuck around with different pitches and volumes to get it dialed it
You mean a digital backing track? If so, the drummer clicks the play button on the tablet, and hears a click. After 4 clicks in his ear he counts the band in to the song, in this case with an 8 count and everyone plays together. Ex: Click 1 2 3 4 then Stick 1 2 3 4 5 6 7 8 then Band plays.