First real answer to the actual post i asked among the 5 answers here.
I liked what you wrote and it's a great idea !
is that how people do that ? like if someone puts leds on hies house for haloween and wants to sync it to music they do so much work also to that beep track ?
could you explain a bit more on what you mean with beep track and feed it to the arduino ?
Also wouldn't a teensy by like 100+ usd board ?