Thanks everyone for all the good advice. The first sunday went okay but the whole thing was so loud that I can hardly hear myself. The saxophonist, keyboard and the chord were just constantly singing too loud especially in the praise songs. I was hoping that the choir will cease some and give room to instrumentalist to do our thing but that never happened. The worship songs was not as bad because I was able to provide some needed melody tune. Another problem I faced is that the keyboard guy was not able to tell me what key he's playing so I have to some how figure it out which sometimes takes some time.