[karla]

For the record, I am in fact using only Revo Minis right now, not the full-size Revo or the Nano.

Are you using the Atom board?
https://librepilot.atlassian.net/wiki/spaces/LPDOC/pages/2818090/CC+Hardware+Configuration

[karla]

You really only need to move whatever is on channel one.  Just move it (only it) to the end instead of shifting them all down one place. 

Thats true. However, it can get really confusing to keep track of the heli setup of the swash plate servos if you do.

[Bobrcnut]

   Karla, the board I'm using is shown in mr_w's post #18 on page 2 here in this thread, the one shown in the upper photo.  Here's a link to its user's manual:
https://d3vs3fai4o12t3.cloudfront.net/media/attachment/file/h/p/hp-fccc3dminif4-man.pdf

Librepilot detects and treats it as an original Revo, not as a Nano or Atom or Mini. 

[karla]

Thank you Bobrcnut.
Also,

How about the power voltage ?
WS2812B has absolute voltage range from +3.5V to +5.3V max.

It's 5.47V, my BEC output 5.5V but can be set to 5.0V.

I changed the BEC output to 5.0V and now the LED is working fine even with all peripherals like GPS, Current sensor, Camera switcher, OSD and telemetry is enabled.
Thank you all.

[Bobrcnut]

Karla:  Thank you for checking.  I was 'led' (no pun intended) astray by the Matek web site, which says 4-7V for the LED strip I'm using.