When panning sounds in your arrangement, ensure that each sound you pan is equally listened to through both left and right channels since more often than not music is broadcast in mono in clubs and throughout your mobile devices: put a stereo imager plugin after your panned sound and check its correlation meter in each band at a time. if the correlation meter keeps running towards the center, move the band cursor of the imager plugin so that the signal moves toward the upper edge. This way you ensure a good translation of the stereo signal even when the sound is played in mono