Ok, i see.
That would be a power regulator for Luxeon III provided by the company in the description of the vid (i do not know if i'm able to mention that name here). However, there is also the possibility to use a resistor as you can see in the vid of the custom saber shop channel. Both work fine.
And then there is the possibility of waiting for a new type of sound board like Onli-Won Kanomi mentioned.
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