The SD2, SD1000, KlaviPro does not have any screens or buttons.
Your keyboard, or your computer, or your ipad need to send program changes to select sounds, etc...

The SD4 has some buttons on it to change sounds.

I have created a PC software called vArranger that you see on this video, who give you access to all the power of the Ketron sound modules.

Not only selecting the sounds well grouped by sound categories.
But also adding a full realtime arranger, who can play Ketron, Yamaha, Roland styles (and soon Korg)