Drum machine need some extra help

https://codepen.io/Moiseychek/pen/pXKWry

hello Campers! so from line 6 in JS section, im working on to start playing music when i click on my buttons, i was wondering if someone can take a look and let me know whats seems the trouble!

pushing it UP on forum branch so someone can see it

pushing it UP on forum branch so someone can see it