Companion Feature request

[ckleanth]

This is an enhancement for companion.
The spreadsheet contains the equations to compute the new channel range based on a given weight and offset.
This is useful if you want to calculate the channel range of a source using a set weight and offset.
I rearranged these equations and workout the new relations to calculate the weight and offset for a desired channel range.
This is useful if you want to calculate the weight and offset for a desired channel range.
I also have a method to create custom expo curves with a linear part that is common for high, mid and low rates