Well the problem is that it will run all the time when the saber is on, any way you wire it. Unless of course you can locate the pinouts on the controller that send signal to the Audio circuits for specific sounds to process.
I suppose you could check all the pinouts while the board is running to see which ones go high when a specific sound plays and run a lead from those.
But I think it would just be safer to run it off the Lux's positive lead in series.
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