Adimatis,
yes, it's a keyboard I already had, but in a sense now it's entirely new... can you guess why?

BTW, you have a very good ear and the reference to 1'37 of "El Negro Zumbon" is correct, but something happens also at 57" and no... they are not sliders moving, but instead something else being triggered...
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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.