Configuring a channel using one Telemetry as its input

[Richard]

Gents, I know that we can define a channel using telemetry data as an input. My target is to use GSpeed or ASpeed as input to make a "dynamic knob" to adjust the gyros' general gain.
All I was able to achieve is to have the channel going from 0 to -100% or 0 to 100%, but I was not able to go from -100 to 100%.
That doesn't make any sense to me. Obviously, I was playing with the offset, curves, but no trick I learned in the last 5 years using FrSky did work.
I hope someone can help me to learn one more trick on how to make this work.
Thanks in advance.

[MikeB]

If you only get 0-100%, try a weight of 200% and an offset of -100%.

Mike

[Richard]

All right!!! It works!!!
Thanks a lot!!!