It shows music volume unit by using fix FFT transformation. Bicolor led panel 16x32 will be connected to music player by audio jack 3.5mm through analog input. During its operation, we can change color of any spectrum bins by touch action.
My Instructables link: https://www.instructables.com/id/LED-MATRIX-TOUCH-CONTROL/
My Youtube: https://www.youtube.com/watch?v=N4TokDFgFXg