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Mario I think you will find the noise you refer to is normal for most channel inputs on most desks, when you apply or remove the phantom volts for the first few seconds there are odd pops and click’s which I guess could be described as shots going off, usually accompanied by the peak light coming on for that channel. I believe this is due to the fact you are applying a DC bias voltage onto a predominantly AC circuit, things like blocking capacitors have to charge up and this causes the odd noise. I am sure Carey will give chapter and verse on this. Most people just wait a few seconds for it to settle down and the noises go away. If they persist it suggests you have some bad microphone leads causing intermittent phantom voltage to the pre-amplifier of the microphone.