just like the last update about 2 years ago, this update messed up my equalizer on iTunes when i turn on airport express to listen to my sound system

this update, just like the update about 2 years ago, made the equalizer on iTunes to stop working whenever i turned on my airport express which is connected to my main sound system. Before I could just downgrade the update and the sound was perfect, now with this update, I could still downgrade, but the sound has no more equalizer