Thank you very much for answering, I was thinking of some kind of automatic software based on an audiometry but your answer has redirected me, thank you very much indeed, my PC uses a motherboard that is supposed to have separate channels, hence I found this program free:
Very simple to use and that allows you to adjust the left and right channel separately with an equalizer for each one, thank you very much and I hope this can help someone else with the same concern.