Hi,
I would need the audio and the unaltered code settings with which the audio was recorded (with my request that VAD is set to the maximum limit where it still can perceive the trigger word when Rejecto is off), according to the instructions in this post:
https://www.politepix.com/forums/topic/how-to-create-a-minimal-case-for-replication/
In your case I would also need to know the distance from the iPad mic to the human speaker and to the music source.
As mentioned, this is not necessarily something where the result is going to be the same behavior between those two implementations because they are not using the same API methods in Sphinx, but I don’t mind taking a look and seeing if there is something to suggest.