Need help with my drum machine

Hey there…so…the only thing I’m missing is the display part to complete this challenge. Believe it or not…I’m not able to get it working…I just want to call a function to update the display state when a button is clicked or pressed. Would be nice to understand what I’m doing wrong here…and…MERRY CHRISTMAS MY DEARS!(https://codepen.io/Eidan78/pen/vYGjdoo)