If you wonder or are worried about latency, here’s a challenge:
R2 → Home Assistant script → Masterlink Gateway virtual button → Masterlink Gateway Macro → Masterlink Gateway Beo 4 command → Beosound 9000 CD-player
Somewhat complicated chain, but the latency is absolutely nonexistent!
R2 to HA to MLGW to Beosound 9000 latency-test (youtube.com)