Beier sound controllerand light setup

[DrDiff]

I am starting to think that to be able to use all channels on my Taranis Plus, I have to use the ECM-2. I purchased the ECM-2 as well as my USM-RC-2. I understand that the USM-RC-2 can detect the motor signal coming out of the RX into the ESC.

This will give me the same number of channels as my RX for sound and control. I have both a 6 channel RX and an 8 channel RX.

This leads to questions...

How do I tell the USM-RC-2 that I want Digital mode?

For example for the head lights, can I string two bulbs on a single output?