Fairly straightforward project.
Use an SD card module and record a wav file of whatever you like on the SD card.
Then with the button press, operate the countdown to play once, and do whatever with the LEDs etc.
Could even include a blast off sound.
Any Arduino should be able to handle the code.
Plenty of examples around on the internet.
Could even add a countdown display in a 16 x 2 LCD or similar.
Best approach is to do one thing at a time and when each is working then combine into the one program.
Start with flashing the LEDs.
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