The organ has 2 manuals (Or more), pedals and expression pedal (Volume), with the manuals able to be split further, therefore the need to sequence (Like you need to do on an arranger) is reduced as a lot more can be played live by the player, thus when sequences are used, they are programmed in by the player and only play the parts that cannot be played live, as they have run out of hands and feet, and while Hector Olivera is a top player, these type of performances are common with organ players. (When they use styles you will find it’s normally just the drums and vamping chord parts that are used, as the orchestrated programming gets in the way of live performance)

Bill