puzzle #4: hey! listen!

fair warning: this puzzle isn't intended for general audiences! i think it's still doable if you aren't in the target demo, but if you don't confidently understand what the title means, you might have a hard time.

regardless, i needed to make this puzzle as soon as i realized the theme worked out. hopefully at least one person out there appreciates it as much as i know i would if i were solving it. 

big thanks to quiara vasquez and jake eakle for test solving this one! applet after the jump, enjoy!