Ive scanned the manual but we are having a problem that cannot be unique.

We are using the only USB output on our PA to feed the Easyworship audio for the live service to Easy Worship for broadcast and recording purposes.  Problem is, when we mute the signal from the PA to the amplifier it also mutes the USB feed which needs to be on fully the entire service, capturing every sound.
We only amplify human speakers.The signal to the amplifier is muted for Piano, Organ and hymms.
What is considered best practice to feed constant audio to Easy Worship to broadcast or record?
Is using a dedicated microphone common practice?