Need White Noise Gone with Piezzo Buzzer

Other Hardware Audio
1

Hello, I am using a MEGA 2560
This code is used to integrate 2 MAX 7219 7 segment, 8 digit displays, 12 LEDs, a piezzo buzzer, a Keypad (for minutes entry and countdown start) and a smoke machine.
I am constantly getting feedback from my piezzo buzzer and I can't figure out why. I have tried to input digitalWrite(BUZZ, Low); and noTone(BUZZ); to see If I can get it to stop. But, no luck.

My Code is attached (too long)

sketch_TIMEBOMB_MAX7219Display_B.ino (13.9 KB)

2

You need some heavy decoupling around the matrix.
It would help if you posted a schematic.

3

Here is a a schematic via fritzing. Not great visually yet.

4

Where?