Thank you for your reply.
Basically I need to measure the first negative peak voltage that shows up on the signal. Assuming that I’ve gathered an array of all the signals samples, I’d first sort them so I get the most negative value. Then, I would perform some calculations with the value and use it to compare if it is within safe limits. If not, my arduino would perform actions to reduce the gain of the amplifier. Something like that.
But looking and what you guys are explaining, I doubt I can get anything useful out of the signal.