LOL....recently, I had my mono mixer button OFF and the stereo button ON, which only allowed it to pass through (1) speaker. Everyone kept saying "turn voice up". Finally realizing what I did, it didn't deter me from repeating the same the next night. Vowing to never happen again, my left speaker was still not producing my vocals again......WTH? Well, this time, I just totally forgot to turn on my speaker Getting old!