JJOS3 and JJOSXL MPC2500

Hi, I have recently purchased the JJOSXL password, I love both OS3 and XL, but there is a problem:
I cannot change the AMP DECAY setting..
everything else works just fine, but how to change a sample decay time?
Is it possible I need to reinstall the OS or something?
Seems strange that a bug like that has not been fixed, impossible not to find it.

thanks!!

The problem was that the program I was using was created in a different OS maybe?
if I load a sample directly it works fantastic!!
Had no idea the JJOS was that deep, every screen is a MIDI gold mine !!!