I am not sure why port 9999 would stay open, but you can check in Terminal:
Code:
camille@gray-matter ~ % sudo lsof -Pi4 ... OSCulator 10839 camille 3u IPv4 0xf8bb8a4707ef54dd 0t0 UDP *:9999 OSCulator 10839 camille 18u IPv4 0xf8bb8a38a48d9475 0t0 TCP *:9999 (LISTEN) ...
You mileage may vary

Best,
Camille
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