Thank you so much for everyone contributing to this thread I basically had the exact same issue as OP, and this thread finally helped me yield numeric outputs.
I only have one question remaining; as I understand it, 128 frequencies will be displayed in the serial monitor, in which the 0th frequency is the most dominant, and the 128th frequency is the least dominant. Since the values scroll so quickly, does anyone have a simple approach to see which values are first in this list, i.e. the ranking such that I may view the most dominant frequencies? seems like something easy but I am honestly confused how to approach this.
Thank you very much to anyone willing to drop some knowledge