Hi
Cyril Blanc wrote:
I did set the start and stop position to 71 1 1 1 and 77 1 1 1
The Transform "Inside" functionality is relative to the start of the Region, NOT the absolute bar numbers in the project

In this "Select only' example, the selected region starts at bar 7, but to select notes within it to reverse, you have to set the transform position parameters correctly:
Select inside bars 1.1.1.1 and 5.1.1.1 within that region.
A second example:

Select inside bars 3.1.1.1 and 5.1.1.1 within that region.
One solution would be to join all your regions together, making sure that the resulting region starts at bar 1. Then you could 'select inside' using the transform as absolute bar numbers
CCT