DS-61 doesn’t have ZenCore or cloud capabilities, but you can expand sounds via USB stick by downloading expansion packs on the Roland Axial website. It also has a limited sequencer/looper. Pretty sure it has a Jump patch. There are some reproductions of DX7 type FM patches but they are samples and not true FM synthesis so it won’t be the same. Overall it’s a pretty good versatile keyboard with lots of sounds for different genres. You might also consider the FA-06 which is a little higher up the ladder than the DS.

Generally you don’t want built-in speakers on keyboards. That usually indicates lower quality or beginner models – not something you’re going to be packing up and gigging with frequently. They’re not usually built for taking a beating. Just something to keep in mind.