I think that's correct.
So to explain it literally:
The first space bar, with your animal sound, is you starting the round.
The voice wil announce a time, let's use 20 seconds for an example.
At the first tick, I believe that's 1 second.
The 4th tick is 4 seconds.
The fifth tick onwards is silent, but is 5, 6, 7, etc. You must use the tick as a counter, and after the 4th tick, i.e: 4 seconds, your brain must do the rest. At, say, 20 seconds, you must press your button during this last second, but must also be the last person to press the button during this second. The actual idea behind this, I think, would eventually be able to get a group of players who are so good that it would come down to literal milliseconds as to who got last.