Discuss worship sound goals with the church leadership and the band members. Before you are able to mix the sound appropriately you must know what kind of sound is right for the congregation and the band's musical style. Let a correct understanding of both lead your mixing choices.
Set each instrument separately. Avoid controlling the sound by increasing the volume. Use the equalizer high, mid and low knobs to create the best sound for that instrument. Low-tones instruments, such as the bass guitar, are best set with increased lows and decreased highs. Instruments intended to provide higher tones, such as a piano or acoustic guitar, will need increased highs and decreased lows. Only adjust these slightly at first if you're unsure.
Balance the overall band sound as the band plays together. Set the volume for each instrument at nearly the same level. The high, mid and low tones of each should be distinct, depending on the role of each. Strive to make each instrument sound its best within the mix while creating a full sound while played together.
Fine-tune for each song according to varying instrumental roles. Bring out the instruments intended to drive the song slightly more than the others. Bring out instruments intended to drive the song slightly more than the others. Set instruments intended to fill out the sound without driving the tempo, such as keyboard pads, electric guitar filler or organ settings,at a slightly lower volume.