Alain,
the velocity sensitivity must be saved as a part of the user program parameters; this means that if you change the velocity sensitivity in the program "Pop 1A" you have to double press the "User Program" bottom, then choose "Memorize" and "Execute". Otherwise, all the changes you make will be lost every time you change program.
Andrea
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Korg Kronos 61 and PA3X-Pro76, Roland G-70, BK7-m and Integra 7, Casio PX-5S, Fender Stratocaster with Fralin pickups, Fender Stratocaster with Kinman pickups, vintage Gibson SG standard.