Reply to Whats up with the Spectra?

Okay so I'm trying to figure out if I wanna buy either the MF3D or the MF Spectra but I'm not really sure what the Spectra still does...

Is there still 4 Banks Mode?

What do the 6 shift keys on the side do?

Is there a way to switch from Remix Decks to your other mapping without having to change the settings?
(Can this be done on the MF3D too?)

Will there be an MF3D coming out that can be customized like the Spectra in the future?


If someone could answer these questions that would be a great deal of help. Thank you!