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i mean i want to record sound using the PA instead of the cameras microphone.
Do not use your camera for audio! Modern camera mics cannot compare to a decent recording setup. My recommendation borrow a laptop, get some recording software a decent audio interface (MIDI) and some decent mics and do it the right way. Not only will it allow you mixing controls and allow you to record multiple parts, but it will also ensure you get a decent live recording. Thats what we used to record my old Jazz band (7 people) and it came out decent. We used my M-audio MIDI unit.
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I'm still puzzled about why MIDI is being mentioned.