Tomas,
all I can say is that organ patches never respond to velocity (unless you program them to do so): an organ sound is an "all or nothing" sound; the only way to control its loudness is through the volume.
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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.