The mininova/supernova line of synth might suit u. Microkorg if u are on budget.
Unless u are doing live performance, go for software ones, I think even shitty VST like garageband (free on every mac) could do it, or logic pro x if u are rich or flying the skulls and bones banner type of person.
No idea mate, doesn't own one, but if u see in the video, it does have it. But i wager it function like those beatpad things where u assign one pad to a beat loop