If you're looking for a controller for the Roland JX-8P/MKS-70/JX-10 you have many options.
The classic original controller, the PG-800 is great if you're a collector mostly concerned about the authenticity of your collection. The original controller works very well IF the faders are still working ok.
The MPG-8 from Retroaktiv is great if you want a new controller that has some extra features, is small and ready for the Vecoven mods for these synths.
Check it out here: https://retroaktivsynthesizers.com/
The opening music is called "We Can Do It" and is mostly made with a actual Roland JX-8P. The song can be found here:
https://espenkraft.bandcamp.com/