Hi,
Unfortunately with LP55281 the audio synchronization works only for the LED mounted on the D3 (the audio synch LED).
If you are looking to control more LEDs with audio synch you might look at LP3954/LP39542 or LP5527/LP55271. Also you could take a look on the programmable part LP5523. It does not have direct audio synch support, but it is possible to do your own audio synch feature with the help of the part programmability for LED lighting sequencing.
Thanks,
Sami